jingcai/node_modules/magic-string/dist/magic-string.umd.js

(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
	typeof define === 'function' && define.amd ? define(factory) :
	(global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.MagicString = factory());
})(this, (function () { 'use strict';

	class BitSet {
		constructor(arg) {
			this.bits = arg instanceof BitSet ? arg.bits.slice() : [];
		}

		add(n) {
			this.bits[n >> 5] |= 1 << (n & 31);
		}

		has(n) {
			return !!(this.bits[n >> 5] & (1 << (n & 31)));
		}
	}

	class Chunk {
		constructor(start, end, content) {
			this.start = start;
			this.end = end;
			this.original = content;

			this.intro = '';
			this.outro = '';

			this.content = content;
			this.storeName = false;
			this.edited = false;

			{
				this.previous = null;
				this.next = null;
			}
		}

		appendLeft(content) {
			this.outro += content;
		}

		appendRight(content) {
			this.intro = this.intro + content;
		}

		clone() {
			const chunk = new Chunk(this.start, this.end, this.original);

			chunk.intro = this.intro;
			chunk.outro = this.outro;
			chunk.content = this.content;
			chunk.storeName = this.storeName;
			chunk.edited = this.edited;

			return chunk;
		}

		contains(index) {
			return this.start < index && index < this.end;
		}

		eachNext(fn) {
			let chunk = this;
			while (chunk) {
				fn(chunk);
				chunk = chunk.next;
			}
		}

		eachPrevious(fn) {
			let chunk = this;
			while (chunk) {
				fn(chunk);
				chunk = chunk.previous;
			}
		}

		edit(content, storeName, contentOnly) {
			this.content = content;
			if (!contentOnly) {
				this.intro = '';
				this.outro = '';
			}
			this.storeName = storeName;

			this.edited = true;

			return this;
		}

		prependLeft(content) {
			this.outro = content + this.outro;
		}

		prependRight(content) {
			this.intro = content + this.intro;
		}

		split(index) {
			const sliceIndex = index - this.start;

			const originalBefore = this.original.slice(0, sliceIndex);
			const originalAfter = this.original.slice(sliceIndex);

			this.original = originalBefore;

			const newChunk = new Chunk(index, this.end, originalAfter);
			newChunk.outro = this.outro;
			this.outro = '';

			this.end = index;

			if (this.edited) {
				// after split we should save the edit content record into the correct chunk
				// to make sure sourcemap correct
				// For example:
				// '  test'.trim()
				//     split   -> '  ' + 'test'
				//   ✔️ edit    -> '' + 'test'
				//   ✖️ edit    -> 'test' + '' 
				// TODO is this block necessary?...
				newChunk.edit('', false);
				this.content = '';
			} else {
				this.content = originalBefore;
			}

			newChunk.next = this.next;
			if (newChunk.next) newChunk.next.previous = newChunk;
			newChunk.previous = this;
			this.next = newChunk;

			return newChunk;
		}

		toString() {
			return this.intro + this.content + this.outro;
		}

		trimEnd(rx) {
			this.outro = this.outro.replace(rx, '');
			if (this.outro.length) return true;

			const trimmed = this.content.replace(rx, '');

			if (trimmed.length) {
				if (trimmed !== this.content) {
					this.split(this.start + trimmed.length).edit('', undefined, true);
					if (this.edited) {
						// save the change, if it has been edited
						this.edit(trimmed, this.storeName, true);
					}
				}
				return true;
			} else {
				this.edit('', undefined, true);

				this.intro = this.intro.replace(rx, '');
				if (this.intro.length) return true;
			}
		}

		trimStart(rx) {
			this.intro = this.intro.replace(rx, '');
			if (this.intro.length) return true;

			const trimmed = this.content.replace(rx, '');

			if (trimmed.length) {
				if (trimmed !== this.content) {
					const newChunk = this.split(this.end - trimmed.length);
					if (this.edited) {
						// save the change, if it has been edited
						newChunk.edit(trimmed, this.storeName, true);
					}
					this.edit('', undefined, true);
				}
				return true;
			} else {
				this.edit('', undefined, true);

				this.outro = this.outro.replace(rx, '');
				if (this.outro.length) return true;
			}
		}
	}

	const comma = ','.charCodeAt(0);
	const semicolon = ';'.charCodeAt(0);
	const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
	const intToChar = new Uint8Array(64); // 64 possible chars.
	const charToInt = new Uint8Array(128); // z is 122 in ASCII
	for (let i = 0; i < chars.length; i++) {
	    const c = chars.charCodeAt(i);
	    intToChar[i] = c;
	    charToInt[c] = i;
	}
	// Provide a fallback for older environments.
	const td = typeof TextDecoder !== 'undefined'
	    ? /* #__PURE__ */ new TextDecoder()
	    : typeof Buffer !== 'undefined'
	        ? {
	            decode(buf) {
	                const out = Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength);
	                return out.toString();
	            },
	        }
	        : {
	            decode(buf) {
	                let out = '';
	                for (let i = 0; i < buf.length; i++) {
	                    out += String.fromCharCode(buf[i]);
	                }
	                return out;
	            },
	        };
	function encode(decoded) {
	    const state = new Int32Array(5);
	    const bufLength = 1024 * 16;
	    const subLength = bufLength - 36;
	    const buf = new Uint8Array(bufLength);
	    const sub = buf.subarray(0, subLength);
	    let pos = 0;
	    let out = '';
	    for (let i = 0; i < decoded.length; i++) {
	        const line = decoded[i];
	        if (i > 0) {
	            if (pos === bufLength) {
	                out += td.decode(buf);
	                pos = 0;
	            }
	            buf[pos++] = semicolon;
	        }
	        if (line.length === 0)
	            continue;
	        state[0] = 0;
	        for (let j = 0; j < line.length; j++) {
	            const segment = line[j];
	            // We can push up to 5 ints, each int can take at most 7 chars, and we
	            // may push a comma.
	            if (pos > subLength) {
	                out += td.decode(sub);
	                buf.copyWithin(0, subLength, pos);
	                pos -= subLength;
	            }
	            if (j > 0)
	                buf[pos++] = comma;
	            pos = encodeInteger(buf, pos, state, segment, 0); // genColumn
	            if (segment.length === 1)
	                continue;
	            pos = encodeInteger(buf, pos, state, segment, 1); // sourcesIndex
	            pos = encodeInteger(buf, pos, state, segment, 2); // sourceLine
	            pos = encodeInteger(buf, pos, state, segment, 3); // sourceColumn
	            if (segment.length === 4)
	                continue;
	            pos = encodeInteger(buf, pos, state, segment, 4); // namesIndex
	        }
	    }
	    return out + td.decode(buf.subarray(0, pos));
	}
	function encodeInteger(buf, pos, state, segment, j) {
	    const next = segment[j];
	    let num = next - state[j];
	    state[j] = next;
	    num = num < 0 ? (-num << 1) | 1 : num << 1;
	    do {
	        let clamped = num & 0b011111;
	        num >>>= 5;
	        if (num > 0)
	            clamped |= 0b100000;
	        buf[pos++] = intToChar[clamped];
	    } while (num > 0);
	    return pos;
	}

	function getBtoa() {
		if (typeof window !== 'undefined' && typeof window.btoa === 'function') {
			return (str) => window.btoa(unescape(encodeURIComponent(str)));
		} else if (typeof Buffer === 'function') {
			return (str) => Buffer.from(str, 'utf-8').toString('base64');
		} else {
			return () => {
				throw new Error('Unsupported environment: `window.btoa` or `Buffer` should be supported.');
			};
		}
	}

	const btoa = /*#__PURE__*/ getBtoa();

	class SourceMap {
		constructor(properties) {
			this.version = 3;
			this.file = properties.file;
			this.sources = properties.sources;
			this.sourcesContent = properties.sourcesContent;
			this.names = properties.names;
			this.mappings = encode(properties.mappings);
			if (typeof properties.x_google_ignoreList !== 'undefined') {
				this.x_google_ignoreList = properties.x_google_ignoreList;
			}
		}

		toString() {
			return JSON.stringify(this);
		}

		toUrl() {
			return 'data:application/json;charset=utf-8;base64,' + btoa(this.toString());
		}
	}

	function guessIndent(code) {
		const lines = code.split('\n');

		const tabbed = lines.filter((line) => /^\t+/.test(line));
		const spaced = lines.filter((line) => /^ {2,}/.test(line));

		if (tabbed.length === 0 && spaced.length === 0) {
			return null;
		}

		// More lines tabbed than spaced? Assume tabs, and
		// default to tabs in the case of a tie (or nothing
		// to go on)
		if (tabbed.length >= spaced.length) {
			return '\t';
		}

		// Otherwise, we need to guess the multiple
		const min = spaced.reduce((previous, current) => {
			const numSpaces = /^ +/.exec(current)[0].length;
			return Math.min(numSpaces, previous);
		}, Infinity);

		return new Array(min + 1).join(' ');
	}

	function getRelativePath(from, to) {
		const fromParts = from.split(/[/\\]/);
		const toParts = to.split(/[/\\]/);

		fromParts.pop(); // get dirname

		while (fromParts[0] === toParts[0]) {
			fromParts.shift();
			toParts.shift();
		}

		if (fromParts.length) {
			let i = fromParts.length;
			while (i--) fromParts[i] = '..';
		}

		return fromParts.concat(toParts).join('/');
	}

	const toString = Object.prototype.toString;

	function isObject(thing) {
		return toString.call(thing) === '[object Object]';
	}

	function getLocator(source) {
		const originalLines = source.split('\n');
		const lineOffsets = [];

		for (let i = 0, pos = 0; i < originalLines.length; i++) {
			lineOffsets.push(pos);
			pos += originalLines[i].length + 1;
		}

		return function locate(index) {
			let i = 0;
			let j = lineOffsets.length;
			while (i < j) {
				const m = (i + j) >> 1;
				if (index < lineOffsets[m]) {
					j = m;
				} else {
					i = m + 1;
				}
			}
			const line = i - 1;
			const column = index - lineOffsets[line];
			return { line, column };
		};
	}

	const wordRegex = /\w/;

	class Mappings {
		constructor(hires) {
			this.hires = hires;
			this.generatedCodeLine = 0;
			this.generatedCodeColumn = 0;
			this.raw = [];
			this.rawSegments = this.raw[this.generatedCodeLine] = [];
			this.pending = null;
		}

		addEdit(sourceIndex, content, loc, nameIndex) {
			if (content.length) {
				let contentLineEnd = content.indexOf('\n', 0);
				let previousContentLineEnd = -1;
				while (contentLineEnd >= 0) {
					const segment = [this.generatedCodeColumn, sourceIndex, loc.line, loc.column];
					if (nameIndex >= 0) {
						segment.push(nameIndex);
					}
					this.rawSegments.push(segment);

					this.generatedCodeLine += 1;
					this.raw[this.generatedCodeLine] = this.rawSegments = [];
					this.generatedCodeColumn = 0;

					previousContentLineEnd = contentLineEnd;
					contentLineEnd = content.indexOf('\n', contentLineEnd + 1);
				}

				const segment = [this.generatedCodeColumn, sourceIndex, loc.line, loc.column];
				if (nameIndex >= 0) {
					segment.push(nameIndex);
				}
				this.rawSegments.push(segment);

				this.advance(content.slice(previousContentLineEnd + 1));
			} else if (this.pending) {
				this.rawSegments.push(this.pending);
				this.advance(content);
			}

			this.pending = null;
		}

		addUneditedChunk(sourceIndex, chunk, original, loc, sourcemapLocations) {
			let originalCharIndex = chunk.start;
			let first = true;
			// when iterating each char, check if it's in a word boundary
			let charInHiresBoundary = false;

			while (originalCharIndex < chunk.end) {
				if (this.hires || first || sourcemapLocations.has(originalCharIndex)) {
					const segment = [this.generatedCodeColumn, sourceIndex, loc.line, loc.column];

					if (this.hires === 'boundary') {
						// in hires "boundary", group segments per word boundary than per char
						if (wordRegex.test(original[originalCharIndex])) {
							// for first char in the boundary found, start the boundary by pushing a segment
							if (!charInHiresBoundary) {
								this.rawSegments.push(segment);
								charInHiresBoundary = true;
							}
						} else {
							// for non-word char, end the boundary by pushing a segment
							this.rawSegments.push(segment);
							charInHiresBoundary = false;
						}
					} else {
						this.rawSegments.push(segment);
					}
				}

				if (original[originalCharIndex] === '\n') {
					loc.line += 1;
					loc.column = 0;
					this.generatedCodeLine += 1;
					this.raw[this.generatedCodeLine] = this.rawSegments = [];
					this.generatedCodeColumn = 0;
					first = true;
				} else {
					loc.column += 1;
					this.generatedCodeColumn += 1;
					first = false;
				}

				originalCharIndex += 1;
			}

			this.pending = null;
		}

		advance(str) {
			if (!str) return;

			const lines = str.split('\n');

			if (lines.length > 1) {
				for (let i = 0; i < lines.length - 1; i++) {
					this.generatedCodeLine++;
					this.raw[this.generatedCodeLine] = this.rawSegments = [];
				}
				this.generatedCodeColumn = 0;
			}

			this.generatedCodeColumn += lines[lines.length - 1].length;
		}
	}

	const n = '\n';

	const warned = {
		insertLeft: false,
		insertRight: false,
		storeName: false,
	};

	class MagicString {
		constructor(string, options = {}) {
			const chunk = new Chunk(0, string.length, string);

			Object.defineProperties(this, {
				original: { writable: true, value: string },
				outro: { writable: true, value: '' },
				intro: { writable: true, value: '' },
				firstChunk: { writable: true, value: chunk },
				lastChunk: { writable: true, value: chunk },
				lastSearchedChunk: { writable: true, value: chunk },
				byStart: { writable: true, value: {} },
				byEnd: { writable: true, value: {} },
				filename: { writable: true, value: options.filename },
				indentExclusionRanges: { writable: true, value: options.indentExclusionRanges },
				sourcemapLocations: { writable: true, value: new BitSet() },
				storedNames: { writable: true, value: {} },
				indentStr: { writable: true, value: undefined },
				ignoreList: { writable: true, value: options.ignoreList },
			});

			this.byStart[0] = chunk;
			this.byEnd[string.length] = chunk;
		}

		addSourcemapLocation(char) {
			this.sourcemapLocations.add(char);
		}

		append(content) {
			if (typeof content !== 'string') throw new TypeError('outro content must be a string');

			this.outro += content;
			return this;
		}

		appendLeft(index, content) {
			if (typeof content !== 'string') throw new TypeError('inserted content must be a string');

			this._split(index);

			const chunk = this.byEnd[index];

			if (chunk) {
				chunk.appendLeft(content);
			} else {
				this.intro += content;
			}
			return this;
		}

		appendRight(index, content) {
			if (typeof content !== 'string') throw new TypeError('inserted content must be a string');

			this._split(index);

			const chunk = this.byStart[index];

			if (chunk) {
				chunk.appendRight(content);
			} else {
				this.outro += content;
			}
			return this;
		}

		clone() {
			const cloned = new MagicString(this.original, { filename: this.filename });

			let originalChunk = this.firstChunk;
			let clonedChunk = (cloned.firstChunk = cloned.lastSearchedChunk = originalChunk.clone());

			while (originalChunk) {
				cloned.byStart[clonedChunk.start] = clonedChunk;
				cloned.byEnd[clonedChunk.end] = clonedChunk;

				const nextOriginalChunk = originalChunk.next;
				const nextClonedChunk = nextOriginalChunk && nextOriginalChunk.clone();

				if (nextClonedChunk) {
					clonedChunk.next = nextClonedChunk;
					nextClonedChunk.previous = clonedChunk;

					clonedChunk = nextClonedChunk;
				}

				originalChunk = nextOriginalChunk;
			}

			cloned.lastChunk = clonedChunk;

			if (this.indentExclusionRanges) {
				cloned.indentExclusionRanges = this.indentExclusionRanges.slice();
			}

			cloned.sourcemapLocations = new BitSet(this.sourcemapLocations);

			cloned.intro = this.intro;
			cloned.outro = this.outro;

			return cloned;
		}

		generateDecodedMap(options) {
			options = options || {};

			const sourceIndex = 0;
			const names = Object.keys(this.storedNames);
			const mappings = new Mappings(options.hires);

			const locate = getLocator(this.original);

			if (this.intro) {
				mappings.advance(this.intro);
			}

			this.firstChunk.eachNext((chunk) => {
				const loc = locate(chunk.start);

				if (chunk.intro.length) mappings.advance(chunk.intro);

				if (chunk.edited) {
					mappings.addEdit(
						sourceIndex,
						chunk.content,
						loc,
						chunk.storeName ? names.indexOf(chunk.original) : -1,
					);
				} else {
					mappings.addUneditedChunk(sourceIndex, chunk, this.original, loc, this.sourcemapLocations);
				}

				if (chunk.outro.length) mappings.advance(chunk.outro);
			});

			return {
				file: options.file ? options.file.split(/[/\\]/).pop() : undefined,
				sources: [
					options.source ? getRelativePath(options.file || '', options.source) : options.file || '',
				],
				sourcesContent: options.includeContent ? [this.original] : undefined,
				names,
				mappings: mappings.raw,
				x_google_ignoreList: this.ignoreList ? [sourceIndex] : undefined,
			};
		}

		generateMap(options) {
			return new SourceMap(this.generateDecodedMap(options));
		}

		_ensureindentStr() {
			if (this.indentStr === undefined) {
				this.indentStr = guessIndent(this.original);
			}
		}

		_getRawIndentString() {
			this._ensureindentStr();
			return this.indentStr;
		}

		getIndentString() {
			this._ensureindentStr();
			return this.indentStr === null ? '\t' : this.indentStr;
		}

		indent(indentStr, options) {
			const pattern = /^[^\r\n]/gm;

			if (isObject(indentStr)) {
				options = indentStr;
				indentStr = undefined;
			}

			if (indentStr === undefined) {
				this._ensureindentStr();
				indentStr = this.indentStr || '\t';
			}

			if (indentStr === '') return this; // noop

			options = options || {};

			// Process exclusion ranges
			const isExcluded = {};

			if (options.exclude) {
				const exclusions =
					typeof options.exclude[0] === 'number' ? [options.exclude] : options.exclude;
				exclusions.forEach((exclusion) => {
					for (let i = exclusion[0]; i < exclusion[1]; i += 1) {
						isExcluded[i] = true;
					}
				});
			}

			let shouldIndentNextCharacter = options.indentStart !== false;
			const replacer = (match) => {
				if (shouldIndentNextCharacter) return `${indentStr}${match}`;
				shouldIndentNextCharacter = true;
				return match;
			};

			this.intro = this.intro.replace(pattern, replacer);

			let charIndex = 0;
			let chunk = this.firstChunk;

			while (chunk) {
				const end = chunk.end;

				if (chunk.edited) {
					if (!isExcluded[charIndex]) {
						chunk.content = chunk.content.replace(pattern, replacer);

						if (chunk.content.length) {
							shouldIndentNextCharacter = chunk.content[chunk.content.length - 1] === '\n';
						}
					}
				} else {
					charIndex = chunk.start;

					while (charIndex < end) {
						if (!isExcluded[charIndex]) {
							const char = this.original[charIndex];

							if (char === '\n') {
								shouldIndentNextCharacter = true;
							} else if (char !== '\r' && shouldIndentNextCharacter) {
								shouldIndentNextCharacter = false;

								if (charIndex === chunk.start) {
									chunk.prependRight(indentStr);
								} else {
									this._splitChunk(chunk, charIndex);
									chunk = chunk.next;
									chunk.prependRight(indentStr);
								}
							}
						}

						charIndex += 1;
					}
				}

				charIndex = chunk.end;
				chunk = chunk.next;
			}

			this.outro = this.outro.replace(pattern, replacer);

			return this;
		}

		insert() {
			throw new Error(
				'magicString.insert(...) is deprecated. Use prependRight(...) or appendLeft(...)',
			);
		}

		insertLeft(index, content) {
			if (!warned.insertLeft) {
				console.warn(
					'magicString.insertLeft(...) is deprecated. Use magicString.appendLeft(...) instead',
				); // eslint-disable-line no-console
				warned.insertLeft = true;
			}

			return this.appendLeft(index, content);
		}

		insertRight(index, content) {
			if (!warned.insertRight) {
				console.warn(
					'magicString.insertRight(...) is deprecated. Use magicString.prependRight(...) instead',
				); // eslint-disable-line no-console
				warned.insertRight = true;
			}

			return this.prependRight(index, content);
		}

		move(start, end, index) {
			if (index >= start && index <= end) throw new Error('Cannot move a selection inside itself');

			this._split(start);
			this._split(end);
			this._split(index);

			const first = this.byStart[start];
			const last = this.byEnd[end];

			const oldLeft = first.previous;
			const oldRight = last.next;

			const newRight = this.byStart[index];
			if (!newRight && last === this.lastChunk) return this;
			const newLeft = newRight ? newRight.previous : this.lastChunk;

			if (oldLeft) oldLeft.next = oldRight;
			if (oldRight) oldRight.previous = oldLeft;

			if (newLeft) newLeft.next = first;
			if (newRight) newRight.previous = last;

			if (!first.previous) this.firstChunk = last.next;
			if (!last.next) {
				this.lastChunk = first.previous;
				this.lastChunk.next = null;
			}

			first.previous = newLeft;
			last.next = newRight || null;

			if (!newLeft) this.firstChunk = first;
			if (!newRight) this.lastChunk = last;
			return this;
		}

		overwrite(start, end, content, options) {
			options = options || {};
			return this.update(start, end, content, { ...options, overwrite: !options.contentOnly });
		}

		update(start, end, content, options) {
			if (typeof content !== 'string') throw new TypeError('replacement content must be a string');

			while (start < 0) start += this.original.length;
			while (end < 0) end += this.original.length;

			if (end > this.original.length) throw new Error('end is out of bounds');
			if (start === end)
				throw new Error(
					'Cannot overwrite a zero-length range – use appendLeft or prependRight instead',
				);

			this._split(start);
			this._split(end);

			if (options === true) {
				if (!warned.storeName) {
					console.warn(
						'The final argument to magicString.overwrite(...) should be an options object. See https://github.com/rich-harris/magic-string',
					); // eslint-disable-line no-console
					warned.storeName = true;
				}

				options = { storeName: true };
			}
			const storeName = options !== undefined ? options.storeName : false;
			const overwrite = options !== undefined ? options.overwrite : false;

			if (storeName) {
				const original = this.original.slice(start, end);
				Object.defineProperty(this.storedNames, original, {
					writable: true,
					value: true,
					enumerable: true,
				});
			}

			const first = this.byStart[start];
			const last = this.byEnd[end];

			if (first) {
				let chunk = first;
				while (chunk !== last) {
					if (chunk.next !== this.byStart[chunk.end]) {
						throw new Error('Cannot overwrite across a split point');
					}
					chunk = chunk.next;
					chunk.edit('', false);
				}

				first.edit(content, storeName, !overwrite);
			} else {
				// must be inserting at the end
				const newChunk = new Chunk(start, end, '').edit(content, storeName);

				// TODO last chunk in the array may not be the last chunk, if it's moved...
				last.next = newChunk;
				newChunk.previous = last;
			}
			return this;
		}

		prepend(content) {
			if (typeof content !== 'string') throw new TypeError('outro content must be a string');

			this.intro = content + this.intro;
			return this;
		}

		prependLeft(index, content) {
			if (typeof content !== 'string') throw new TypeError('inserted content must be a string');

			this._split(index);

			const chunk = this.byEnd[index];

			if (chunk) {
				chunk.prependLeft(content);
			} else {
				this.intro = content + this.intro;
			}
			return this;
		}

		prependRight(index, content) {
			if (typeof content !== 'string') throw new TypeError('inserted content must be a string');

			this._split(index);

			const chunk = this.byStart[index];

			if (chunk) {
				chunk.prependRight(content);
			} else {
				this.outro = content + this.outro;
			}
			return this;
		}

		remove(start, end) {
			while (start < 0) start += this.original.length;
			while (end < 0) end += this.original.length;

			if (start === end) return this;

			if (start < 0 || end > this.original.length) throw new Error('Character is out of bounds');
			if (start > end) throw new Error('end must be greater than start');

			this._split(start);
			this._split(end);

			let chunk = this.byStart[start];

			while (chunk) {
				chunk.intro = '';
				chunk.outro = '';
				chunk.edit('');

				chunk = end > chunk.end ? this.byStart[chunk.end] : null;
			}
			return this;
		}

		lastChar() {
			if (this.outro.length) return this.outro[this.outro.length - 1];
			let chunk = this.lastChunk;
			do {
				if (chunk.outro.length) return chunk.outro[chunk.outro.length - 1];
				if (chunk.content.length) return chunk.content[chunk.content.length - 1];
				if (chunk.intro.length) return chunk.intro[chunk.intro.length - 1];
			} while ((chunk = chunk.previous));
			if (this.intro.length) return this.intro[this.intro.length - 1];
			return '';
		}

		lastLine() {
			let lineIndex = this.outro.lastIndexOf(n);
			if (lineIndex !== -1) return this.outro.substr(lineIndex + 1);
			let lineStr = this.outro;
			let chunk = this.lastChunk;
			do {
				if (chunk.outro.length > 0) {
					lineIndex = chunk.outro.lastIndexOf(n);
					if (lineIndex !== -1) return chunk.outro.substr(lineIndex + 1) + lineStr;
					lineStr = chunk.outro + lineStr;
				}

				if (chunk.content.length > 0) {
					lineIndex = chunk.content.lastIndexOf(n);
					if (lineIndex !== -1) return chunk.content.substr(lineIndex + 1) + lineStr;
					lineStr = chunk.content + lineStr;
				}

				if (chunk.intro.length > 0) {
					lineIndex = chunk.intro.lastIndexOf(n);
					if (lineIndex !== -1) return chunk.intro.substr(lineIndex + 1) + lineStr;
					lineStr = chunk.intro + lineStr;
				}
			} while ((chunk = chunk.previous));
			lineIndex = this.intro.lastIndexOf(n);
			if (lineIndex !== -1) return this.intro.substr(lineIndex + 1) + lineStr;
			return this.intro + lineStr;
		}

		slice(start = 0, end = this.original.length) {
			while (start < 0) start += this.original.length;
			while (end < 0) end += this.original.length;

			let result = '';

			// find start chunk
			let chunk = this.firstChunk;
			while (chunk && (chunk.start > start || chunk.end <= start)) {
				// found end chunk before start
				if (chunk.start < end && chunk.end >= end) {
					return result;
				}

				chunk = chunk.next;
			}

			if (chunk && chunk.edited && chunk.start !== start)
				throw new Error(`Cannot use replaced character ${start} as slice start anchor.`);

			const startChunk = chunk;
			while (chunk) {
				if (chunk.intro && (startChunk !== chunk || chunk.start === start)) {
					result += chunk.intro;
				}

				const containsEnd = chunk.start < end && chunk.end >= end;
				if (containsEnd && chunk.edited && chunk.end !== end)
					throw new Error(`Cannot use replaced character ${end} as slice end anchor.`);

				const sliceStart = startChunk === chunk ? start - chunk.start : 0;
				const sliceEnd = containsEnd ? chunk.content.length + end - chunk.end : chunk.content.length;

				result += chunk.content.slice(sliceStart, sliceEnd);

				if (chunk.outro && (!containsEnd || chunk.end === end)) {
					result += chunk.outro;
				}

				if (containsEnd) {
					break;
				}

				chunk = chunk.next;
			}

			return result;
		}

		// TODO deprecate this? not really very useful
		snip(start, end) {
			const clone = this.clone();
			clone.remove(0, start);
			clone.remove(end, clone.original.length);

			return clone;
		}

		_split(index) {
			if (this.byStart[index] || this.byEnd[index]) return;

			let chunk = this.lastSearchedChunk;
			const searchForward = index > chunk.end;

			while (chunk) {
				if (chunk.contains(index)) return this._splitChunk(chunk, index);

				chunk = searchForward ? this.byStart[chunk.end] : this.byEnd[chunk.start];
			}
		}

		_splitChunk(chunk, index) {
			if (chunk.edited && chunk.content.length) {
				// zero-length edited chunks are a special case (overlapping replacements)
				const loc = getLocator(this.original)(index);
				throw new Error(
					`Cannot split a chunk that has already been edited (${loc.line}:${loc.column} – "${chunk.original}")`,
				);
			}

			const newChunk = chunk.split(index);

			this.byEnd[index] = chunk;
			this.byStart[index] = newChunk;
			this.byEnd[newChunk.end] = newChunk;

			if (chunk === this.lastChunk) this.lastChunk = newChunk;

			this.lastSearchedChunk = chunk;
			return true;
		}

		toString() {
			let str = this.intro;

			let chunk = this.firstChunk;
			while (chunk) {
				str += chunk.toString();
				chunk = chunk.next;
			}

			return str + this.outro;
		}

		isEmpty() {
			let chunk = this.firstChunk;
			do {
				if (
					(chunk.intro.length && chunk.intro.trim()) ||
					(chunk.content.length && chunk.content.trim()) ||
					(chunk.outro.length && chunk.outro.trim())
				)
					return false;
			} while ((chunk = chunk.next));
			return true;
		}

		length() {
			let chunk = this.firstChunk;
			let length = 0;
			do {
				length += chunk.intro.length + chunk.content.length + chunk.outro.length;
			} while ((chunk = chunk.next));
			return length;
		}

		trimLines() {
			return this.trim('[\\r\\n]');
		}

		trim(charType) {
			return this.trimStart(charType).trimEnd(charType);
		}

		trimEndAborted(charType) {
			const rx = new RegExp((charType || '\\s') + '+$');

			this.outro = this.outro.replace(rx, '');
			if (this.outro.length) return true;

			let chunk = this.lastChunk;

			do {
				const end = chunk.end;
				const aborted = chunk.trimEnd(rx);

				// if chunk was trimmed, we have a new lastChunk
				if (chunk.end !== end) {
					if (this.lastChunk === chunk) {
						this.lastChunk = chunk.next;
					}

					this.byEnd[chunk.end] = chunk;
					this.byStart[chunk.next.start] = chunk.next;
					this.byEnd[chunk.next.end] = chunk.next;
				}

				if (aborted) return true;
				chunk = chunk.previous;
			} while (chunk);

			return false;
		}

		trimEnd(charType) {
			this.trimEndAborted(charType);
			return this;
		}
		trimStartAborted(charType) {
			const rx = new RegExp('^' + (charType || '\\s') + '+');

			this.intro = this.intro.replace(rx, '');
			if (this.intro.length) return true;

			let chunk = this.firstChunk;

			do {
				const end = chunk.end;
				const aborted = chunk.trimStart(rx);

				if (chunk.end !== end) {
					// special case...
					if (chunk === this.lastChunk) this.lastChunk = chunk.next;

					this.byEnd[chunk.end] = chunk;
					this.byStart[chunk.next.start] = chunk.next;
					this.byEnd[chunk.next.end] = chunk.next;
				}

				if (aborted) return true;
				chunk = chunk.next;
			} while (chunk);

			return false;
		}

		trimStart(charType) {
			this.trimStartAborted(charType);
			return this;
		}

		hasChanged() {
			return this.original !== this.toString();
		}

		_replaceRegexp(searchValue, replacement) {
			function getReplacement(match, str) {
				if (typeof replacement === 'string') {
					return replacement.replace(/\$(\$|&|\d+)/g, (_, i) => {
						// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace#specifying_a_string_as_a_parameter
						if (i === '$') return '$';
						if (i === '&') return match[0];
						const num = +i;
						if (num < match.length) return match[+i];
						return `$${i}`;
					});
				} else {
					return replacement(...match, match.index, str, match.groups);
				}
			}
			function matchAll(re, str) {
				let match;
				const matches = [];
				while ((match = re.exec(str))) {
					matches.push(match);
				}
				return matches;
			}
			if (searchValue.global) {
				const matches = matchAll(searchValue, this.original);
				matches.forEach((match) => {
					if (match.index != null)
						this.overwrite(
							match.index,
							match.index + match[0].length,
							getReplacement(match, this.original),
						);
				});
			} else {
				const match = this.original.match(searchValue);
				if (match && match.index != null)
					this.overwrite(
						match.index,
						match.index + match[0].length,
						getReplacement(match, this.original),
					);
			}
			return this;
		}

		_replaceString(string, replacement) {
			const { original } = this;
			const index = original.indexOf(string);

			if (index !== -1) {
				this.overwrite(index, index + string.length, replacement);
			}

			return this;
		}

		replace(searchValue, replacement) {
			if (typeof searchValue === 'string') {
				return this._replaceString(searchValue, replacement);
			}

			return this._replaceRegexp(searchValue, replacement);
		}

		_replaceAllString(string, replacement) {
			const { original } = this;
			const stringLength = string.length;
			for (
				let index = original.indexOf(string);
				index !== -1;
				index = original.indexOf(string, index + stringLength)
			) {
				this.overwrite(index, index + stringLength, replacement);
			}

			return this;
		}

		replaceAll(searchValue, replacement) {
			if (typeof searchValue === 'string') {
				return this._replaceAllString(searchValue, replacement);
			}

			if (!searchValue.global) {
				throw new TypeError(
					'MagicString.prototype.replaceAll called with a non-global RegExp argument',
				);
			}

			return this._replaceRegexp(searchValue, replacement);
		}
	}

	const hasOwnProp = Object.prototype.hasOwnProperty;

	class Bundle {
		constructor(options = {}) {
			this.intro = options.intro || '';
			this.separator = options.separator !== undefined ? options.separator : '\n';
			this.sources = [];
			this.uniqueSources = [];
			this.uniqueSourceIndexByFilename = {};
		}

		addSource(source) {
			if (source instanceof MagicString) {
				return this.addSource({
					content: source,
					filename: source.filename,
					separator: this.separator,
				});
			}

			if (!isObject(source) || !source.content) {
				throw new Error(
					'bundle.addSource() takes an object with a `content` property, which should be an instance of MagicString, and an optional `filename`',
				);
			}

			['filename', 'ignoreList', 'indentExclusionRanges', 'separator'].forEach((option) => {
				if (!hasOwnProp.call(source, option)) source[option] = source.content[option];
			});

			if (source.separator === undefined) {
				// TODO there's a bunch of this sort of thing, needs cleaning up
				source.separator = this.separator;
			}

			if (source.filename) {
				if (!hasOwnProp.call(this.uniqueSourceIndexByFilename, source.filename)) {
					this.uniqueSourceIndexByFilename[source.filename] = this.uniqueSources.length;
					this.uniqueSources.push({ filename: source.filename, content: source.content.original });
				} else {
					const uniqueSource = this.uniqueSources[this.uniqueSourceIndexByFilename[source.filename]];
					if (source.content.original !== uniqueSource.content) {
						throw new Error(`Illegal source: same filename (${source.filename}), different contents`);
					}
				}
			}

			this.sources.push(source);
			return this;
		}

		append(str, options) {
			this.addSource({
				content: new MagicString(str),
				separator: (options && options.separator) || '',
			});

			return this;
		}

		clone() {
			const bundle = new Bundle({
				intro: this.intro,
				separator: this.separator,
			});

			this.sources.forEach((source) => {
				bundle.addSource({
					filename: source.filename,
					content: source.content.clone(),
					separator: source.separator,
				});
			});

			return bundle;
		}

		generateDecodedMap(options = {}) {
			const names = [];
			let x_google_ignoreList = undefined;
			this.sources.forEach((source) => {
				Object.keys(source.content.storedNames).forEach((name) => {
					if (!~names.indexOf(name)) names.push(name);
				});
			});

			const mappings = new Mappings(options.hires);

			if (this.intro) {
				mappings.advance(this.intro);
			}

			this.sources.forEach((source, i) => {
				if (i > 0) {
					mappings.advance(this.separator);
				}

				const sourceIndex = source.filename ? this.uniqueSourceIndexByFilename[source.filename] : -1;
				const magicString = source.content;
				const locate = getLocator(magicString.original);

				if (magicString.intro) {
					mappings.advance(magicString.intro);
				}

				magicString.firstChunk.eachNext((chunk) => {
					const loc = locate(chunk.start);

					if (chunk.intro.length) mappings.advance(chunk.intro);

					if (source.filename) {
						if (chunk.edited) {
							mappings.addEdit(
								sourceIndex,
								chunk.content,
								loc,
								chunk.storeName ? names.indexOf(chunk.original) : -1,
							);
						} else {
							mappings.addUneditedChunk(
								sourceIndex,
								chunk,
								magicString.original,
								loc,
								magicString.sourcemapLocations,
							);
						}
					} else {
						mappings.advance(chunk.content);
					}

					if (chunk.outro.length) mappings.advance(chunk.outro);
				});

				if (magicString.outro) {
					mappings.advance(magicString.outro);
				}

				if (source.ignoreList && sourceIndex !== -1) {
					if (x_google_ignoreList === undefined) {
						x_google_ignoreList = [];
					}
					x_google_ignoreList.push(sourceIndex);
				}
			});

			return {
				file: options.file ? options.file.split(/[/\\]/).pop() : undefined,
				sources: this.uniqueSources.map((source) => {
					return options.file ? getRelativePath(options.file, source.filename) : source.filename;
				}),
				sourcesContent: this.uniqueSources.map((source) => {
					return options.includeContent ? source.content : null;
				}),
				names,
				mappings: mappings.raw,
				x_google_ignoreList,
			};
		}

		generateMap(options) {
			return new SourceMap(this.generateDecodedMap(options));
		}

		getIndentString() {
			const indentStringCounts = {};

			this.sources.forEach((source) => {
				const indentStr = source.content._getRawIndentString();

				if (indentStr === null) return;

				if (!indentStringCounts[indentStr]) indentStringCounts[indentStr] = 0;
				indentStringCounts[indentStr] += 1;
			});

			return (
				Object.keys(indentStringCounts).sort((a, b) => {
					return indentStringCounts[a] - indentStringCounts[b];
				})[0] || '\t'
			);
		}

		indent(indentStr) {
			if (!arguments.length) {
				indentStr = this.getIndentString();
			}

			if (indentStr === '') return this; // noop

			let trailingNewline = !this.intro || this.intro.slice(-1) === '\n';

			this.sources.forEach((source, i) => {
				const separator = source.separator !== undefined ? source.separator : this.separator;
				const indentStart = trailingNewline || (i > 0 && /\r?\n$/.test(separator));

				source.content.indent(indentStr, {
					exclude: source.indentExclusionRanges,
					indentStart, //: trailingNewline || /\r?\n$/.test( separator )  //true///\r?\n/.test( separator )
				});

				trailingNewline = source.content.lastChar() === '\n';
			});

			if (this.intro) {
				this.intro =
					indentStr +
					this.intro.replace(/^[^\n]/gm, (match, index) => {
						return index > 0 ? indentStr + match : match;
					});
			}

			return this;
		}

		prepend(str) {
			this.intro = str + this.intro;
			return this;
		}

		toString() {
			const body = this.sources
				.map((source, i) => {
					const separator = source.separator !== undefined ? source.separator : this.separator;
					const str = (i > 0 ? separator : '') + source.content.toString();

					return str;
				})
				.join('');

			return this.intro + body;
		}

		isEmpty() {
			if (this.intro.length && this.intro.trim()) return false;
			if (this.sources.some((source) => !source.content.isEmpty())) return false;
			return true;
		}

		length() {
			return this.sources.reduce(
				(length, source) => length + source.content.length(),
				this.intro.length,
			);
		}

		trimLines() {
			return this.trim('[\\r\\n]');
		}

		trim(charType) {
			return this.trimStart(charType).trimEnd(charType);
		}

		trimStart(charType) {
			const rx = new RegExp('^' + (charType || '\\s') + '+');
			this.intro = this.intro.replace(rx, '');

			if (!this.intro) {
				let source;
				let i = 0;

				do {
					source = this.sources[i++];
					if (!source) {
						break;
					}
				} while (!source.content.trimStartAborted(charType));
			}

			return this;
		}

		trimEnd(charType) {
			const rx = new RegExp((charType || '\\s') + '+$');

			let source;
			let i = this.sources.length - 1;

			do {
				source = this.sources[i--];
				if (!source) {
					this.intro = this.intro.replace(rx, '');
					break;
				}
			} while (!source.content.trimEndAborted(charType));

			return this;
		}
	}

	MagicString.Bundle = Bundle;
	MagicString.SourceMap = SourceMap;
	MagicString.default = MagicString; // work around TypeScript bug https://github.com/Rich-Harris/magic-string/pull/121

	return MagicString;

}));
//# sourceMappingURL=magic-string.umd.js.map