@a-la/source-map-generator

@a-la/source-map-generator is a fork of Mozilla/SourceMap that Generates Source Maps and Works With Google Closure Compiler. It was rewritten in ES6 syntax and externs for GCC were provided for compilation.

yarn add @a-la/source-map-generator

Table Of Contents

• Table Of Contents
• API
• class SourceMapGenerator
  • constructor(conf: Config): SourceMapGenerator
    • _sourceMapGenerator.Config
• Copyright

API

The package is available by importing its default function:

importsourceMapGeneratorfrom'@a-la/source-map-generator'

class SourceMapGenerator

An instance of the SourceMapGenerator represents a source map which is being built incrementally.

Removed Methods For Now

• static fromSourceMap
• applySourceMap

constructor(
conf: Config,
): SourceMapGenerator

The constructor method is called to create a new source map.

_sourceMapGenerator.Config: Options for the program.

Name	Type	Description	Default
file	string	The filename of the generated source.	-
sourceRoot	string	A root for all relative URLs in this source map.	-
skipValidation	boolean	When true, disables validation of mappings as they are added. This can improve performance but should be used with discretion, as a last resort. Even then, one should avoid using this flag when running tests, if possible.	false

importSourceMapGeneratorfrom'@a-la/source-map-generator'import{readFileSync}from'fs'constfile=`${readFileSync(__filename)}`constgen=newSourceMapGenerator({file: 'example/index.js',})/** * Generate the source map for the file, keeping all positions as they are. * * The first two rules will update inline and block comments to not have any tokens in them. * The third rule will break each line into tokens and add mappings. */constlinesInSource=file.replace(/\/\*(?:[\s\S]+?)\*\//g,(match,pos)=>{constnext=file[pos+match.length]if(next=='\n')return'\n'.repeat(match.split('\n').length-1)constlines=match.split('\n')constlastLineI=lines.length-1constlastLine=lines[lastLineI]constss=' '.repeat(lastLine.length)constws='\n'.repeat(lastLineI)return`${ws}${ss}`}).replace(/\/\/(.+)/gm,(match)=>{return' '.repeat(match.length)}).split('\n')linesInSource.forEach((l,i)=>{constline=i+1l.replace(/(?:(?:\s+)|(?:[$_\w\d]+)|.)/g,(match,column)=>{if(column==0&&/^\s+$/.test(match))returnconstgenerated={
line,
column,}constm={
generated,source: __filename,original: generated,}gen.addMapping(m)})})gen.setSourceContent(__filename,file)constsourceMap=gen.toJSON()console.log(sourceMap)

{version: 3,sources: ['/Users/zavr/a-la/source-map-generator/example/index.js'],names: [],mappings: 'AAAA,MAAM,CAAC,kBAAkB,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC,CAAC,GAAG;AACtC,MAAM,CAAC,CAAC,CAAC,YAAY,CAAC,CAAC,CAAC,IAAI,CAAC,CAAC,EAAE;;AAEhC,KAAK,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,YAAY,CAAC,UAAU,CAAC,CAAC;;AAEzC,KAAK,CAAC,GAAG,CAAC,CAAC,CAAC,GAAG,CAAC,kBAAkB,CAAC;EACjC,IAAI,CAAC,CAAC,CAAC,OAAO,CAAC,KAAK,CAAC,EAAE,CAAC;AAC1B,CAAC;;;;;;;AAOD,KAAK,CAAC,aAAa,CAAC,CAAC,CAAC;EACpB,CAAC,OAAO,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC;IAC3B,KAAK,CAAC,IAAI,CAAC,CAAC,CAAC,IAAI,CAAC,GAAG,CAAC,CAAC,CAAC,KAAK,CAAC,MAAM;IACpC,EAAE,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,MAAM,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,MAAM,CAAC,KAAK,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,MAAM,CAAC,CAAC,CAAC,CAAC;;IAEjE,KAAK,CAAC,KAAK,CAAC,CAAC,CAAC,KAAK,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC,CAAC;IAC9B,KAAK,CAAC,SAAS,CAAC,CAAC,CAAC,KAAK,CAAC,MAAM,CAAC,CAAC,CAAC;IACjC,KAAK,CAAC,QAAQ,CAAC,CAAC,CAAC,KAAK,CAAC,SAAS;IAChC,KAAK,CAAC,EAAE,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,MAAM,CAAC,QAAQ,CAAC,MAAM;IACrC,KAAK,CAAC,EAAE,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,MAAM,CAAC,SAAS;IAChC,MAAM,CAAC,CAAC,CAAC,CAAC,EAAE,CAAC,CAAC,CAAC,EAAE,CAAC;EACpB,CAAC;EACD,CAAC,OAAO,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,EAAE,CAAC,CAAC,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC,CAAC;IAChC,MAAM,CAAC,CAAC,CAAC,CAAC,CAAC,MAAM,CAAC,KAAK,CAAC,MAAM;EAChC,CAAC;EACD,CAAC,KAAK,CAAC,CAAC,CAAC,CAAC,CAAC;AACb,aAAa,CAAC,OAAO,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC;EAC9B,KAAK,CAAC,IAAI,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC;EACjB;IACE,CAAC,OAAO,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,EAAE,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,KAAK,CAAC,CAAC,MAAM,CAAC,CAAC,CAAC,CAAC,CAAC;MAC1D,EAAE,CAAC,CAAC,MAAM,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,CAAC,IAAI,CAAC,KAAK,CAAC,CAAC,CAAC;MACxC,KAAK,CAAC,SAAS,CAAC,CAAC,CAAC;QAChB,IAAI;QACJ,MAAM;MACR;MACA,KAAK,CAAC,CAAC,CAAC,CAAC,CAAC;QACR,SAAS;QACT,MAAM,CAAC,CAAC,UAAU;QAClB,QAAQ,CAAC,CAAC,SAAS;MACrB;MACA,GAAG,CAAC,UAAU,CAAC,CAAC;IAClB,CAAC;AACL,CAAC;AACD,GAAG,CAAC,gBAAgB,CAAC,UAAU,CAAC,CAAC,IAAI;AACrC,KAAK,CAAC,SAAS,CAAC,CAAC,CAAC,GAAG,CAAC,MAAM,CAAC;AAC7B,OAAO,CAAC,GAAG,CAAC,SAAS',file: 'example/index.js',sourcesContent: ['import SourceMapGenerator from \'../src\'\nimport { readFileSync } from \'fs\'\n\nconst file = `${readFileSync(__filename)}`\n\nconst gen = new SourceMapGenerator({\n file: \'example/index.js\',\n})\n/**\n * Generate the source map for the file, keeping all positions as they are.\n *\n * The first two rules will update inline and block comments to not have any tokens in them.\n * The third rule will break each line into tokens and add mappings.\n */\nconst linesInSource = file\n .replace(/\\/\\*(?:[\\s\\S]+?)\\*\\//g, (match, pos) => {\n const next = file[pos + match.length]\n if (next == \'\\n\') return \'\\n\'.repeat(match.split(\'\\n\').length - 1)\n\n const lines = match.split(\'\\n\')\n const lastLineI = lines.length - 1\n const lastLine = lines[lastLineI]\n const ss = \' \'.repeat(lastLine.length)\n const ws = \'\\n\'.repeat(lastLineI)\n return `${ws}${ss}`\n })\n .replace(/\\/\\/(.+)/gm, (match) => {\n return \' \'.repeat(match.length)\n })\n .split(\'\\n\')\nlinesInSource.forEach((l, i) => {\n const line = i + 1\n l\n .replace(/(?:(?:\\s+)|(?:[$_\\w\\d]+)|.)/g, (match, column) => {\n if (column == 0 && /^\\s+$/.test(match)) return\n const generated = {\n line,\n column,\n }\n const m = {\n generated,\n source: __filename,\n original: generated,\n }\n gen.addMapping(m)\n })\n})\ngen.setSourceContent(__filename, file)\nconst sourceMap = gen.toJSON()\nconsole.log(sourceMap)']}

Copyright

Original Authors: Mozilla

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