const createHash = require('webpack/lib/util/createHash')
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module.exports = class CustomModuleIdsPlugin {
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constructor (options) {
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this.options = Object.assign({
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prefix: '',
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hashFunction: 'md4',
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hashDigest: 'base64',
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hashDigestLength: 4
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}, options || {})
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}
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apply (compiler) {
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const options = this.options
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compiler.hooks.compilation.tap('CustomModuleIdsPlugin', compilation => {
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const usedIds = new Set()
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compilation.hooks.beforeModuleIds.tap('CustomModuleIdsPlugin', modules => {
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for (const module of modules) {
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if (module.id !== null) {
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continue
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}
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const libIdent = module.libIdent
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? module.libIdent({
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context: options.context || compiler.options.context
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}) : null
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let id = options.custom && options.custom(libIdent, module)
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if (!id && libIdent) {
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const hash = createHash(options.hashFunction)
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hash.update(options.prefix + libIdent)
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const hashId = (hash.digest(options.hashDigest))
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let len = options.hashDigestLength
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while (usedIds.has(hashId.substr(0, len))) len++
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id = hashId.substr(0, len)
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usedIds.add(id)
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}
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if (id) {
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module.id = id
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}
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}
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})
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})
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}
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}
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