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Revert "Upgrade webpack to 2.x (#14786)"
This reverts commit 46d5676.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| const crypto = require( 'crypto' ); | ||
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| const md5Cache = {}; | ||
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| function md5( content ) { | ||
| if ( ! md5Cache[ content ] ) { | ||
| md5Cache[ content ] = crypto.createHash( 'md5' ).update( content, 'utf-8' ).digest( 'hex' ); | ||
| } | ||
| return md5Cache[ content ]; | ||
| } | ||
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| function hashToId( hash, seed, hashSize ) { | ||
| // Generate a unsigned integer sized <hashSize> bits using a part of the MD5 | ||
| // hash. Seed is a number 0..31 and the hash is expected to be 32 chars | ||
| // (nibbles) long. | ||
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| // double the hash to allow overflow | ||
| hash = hash + hash; | ||
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| // get lower and upper 28 bits | ||
| const lsb = parseInt( hash.substr( seed, 7 ), 16 ); | ||
| const msb = parseInt( hash.substr( seed + 7, 7 ), 16 ); | ||
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| // combine them to get the ID | ||
| // NOTE: Logical operators only work up to 31 bits (because values will be | ||
| // casted to 32bit signed integer), so we use classic arithmetic! | ||
| const lsbBits = Math.min( 28, hashSize ); | ||
| const msbBits = Math.max( 0, hashSize - 28 ); | ||
| const lsbMask = Math.pow( 2, lsbBits ) - 1; | ||
| const msbMask = Math.pow( 2, msbBits ) - 1; | ||
| return ( lsb & lsbMask ) + ( ( msb & msbMask ) * Math.pow( 2, 28 ) ); | ||
| } | ||
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| function sortById( a, b ) { | ||
| return a > b ? 1 : a < b ? -1 : 0; //eslint-disable-line no-nested-ternary | ||
| } | ||
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| function getModuleSource( module ) { | ||
| return { | ||
| id: module.id, | ||
| source: ( module._source || {} )._value || '', | ||
| dependencies: ( module.dependencies || [] ).map( function( d ) { | ||
| return d.module ? d.module.id : ''; | ||
| } ) | ||
| }; | ||
| } | ||
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| function concatenateSource( result, module ) { | ||
| return result + '#' + module.id + ':' + module.source + '$' + ( module.dependencies.join( ',' ) ); | ||
| } | ||
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| function WebpackStableBuildPlugin( options ) { | ||
| this.options = options || {}; | ||
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| this.algorithm = options.algorithm || 'md5'; | ||
| this.digest = options.digest || 'hex'; | ||
| } | ||
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| WebpackStableBuildPlugin.prototype.apply = function( compiler ) { | ||
| const usedChunkIds = {}; | ||
| const usedModuleIds = {}; | ||
| const context = compiler.options.context; | ||
| const seed = ( +this.options.seed || 0 ) % 32; | ||
| const hashSize = ( +this.options.hashSize || 53 ); | ||
| const _plugin = this; | ||
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| if ( hashSize > 53 ) { | ||
| // In JavaScript, only integers up to 2^53 (exclusive) can be considered | ||
| // safe, see http://www.2ality.com/2013/10/safe-integers.html | ||
| throw new Error( 'hashSize too large' ); | ||
| } | ||
|
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| function genChunkId( chunkName ) { | ||
| const hash = md5( chunkName ); | ||
| // generate a 28 bit integer using a part of the MD5 hash | ||
| const id = hashToId( hash, seed, hashSize ); | ||
| if ( usedChunkIds.hasOwnProperty( id ) && usedChunkIds[ id ] !== chunkName ) { | ||
| throw new Error( 'chunk id collision' ); | ||
| } | ||
| return id; | ||
| } | ||
|
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| function genModuleId( modulePath ) { | ||
| const hash = md5( modulePath ); | ||
| // generate a 28 bit integer using a part of the MD5 hash | ||
| const id = hashToId( hash, seed, hashSize ); | ||
| if ( usedModuleIds.hasOwnProperty( id ) && usedModuleIds[ id ] !== modulePath ) { | ||
| throw new Error( 'module id collision' ); | ||
| } | ||
| return id; | ||
| } | ||
|
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| compiler.plugin( 'compilation', function( compilation ) { | ||
| compilation.plugin( 'before-chunk-ids', function( chunks ) { | ||
| chunks.forEach( function( chunk ) { | ||
| const chunkName = chunk.name; | ||
| if ( ! chunkName ) { | ||
| return; | ||
| } | ||
| chunk.id = genChunkId( chunkName ); | ||
| usedChunkIds[ chunk.id ] = chunkName; | ||
| } ); | ||
| } ); | ||
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| compilation.plugin( 'before-module-ids', function( modules ) { | ||
| modules.forEach( function( module ) { | ||
| if ( module.libIdent && module.id === null ) { | ||
| const modulePath = module.libIdent( { | ||
| context: context | ||
| } ); | ||
| module.id = genModuleId( modulePath ); | ||
| usedModuleIds[ module.id ] = modulePath; | ||
| } | ||
| } ); | ||
| } ); | ||
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| compilation.plugin( 'chunk-hash', function( chunk, chunkHash ) { | ||
| const source = chunk.modules.map( getModuleSource ).sort( sortById ).reduce( concatenateSource, '' ); | ||
| const hash = crypto.createHash( _plugin.algorithm ).update( source ); | ||
| // have to include the seed to get different hashes for different seeds | ||
| hash.update( seed.toString( 16 ) ); | ||
|
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| chunkHash.digest = function( digest ) { | ||
| return hash.digest( digest || _plugin.digest ); | ||
| }; | ||
| } ); | ||
| } ); | ||
| }; | ||
|
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| module.exports = WebpackStableBuildPlugin; |
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