46 lines
1.2 KiB
JavaScript
46 lines
1.2 KiB
JavaScript
'use strict';
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const CHUNK_OPTIONS = ['all', 'async'];
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const getPublicPath = require('./common.js').getPublicPath;
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const createResourceHint = require('./resource-hints.js').createResourceHint;
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const matches = require('./common.js').matches;
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const addAsyncChunkResourceHints = (chunks, options) => {
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const getRef = generateRef(options);
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const hints = [];
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chunks
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.filter(chunk => !isInitial(chunk))
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.reduce(
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(files, chunk) => files.concat(chunk.files),
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[])
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.forEach(file => {
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if (optionsMatch(options.preload, file)) {
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hints.push(createResourceHint('preload', getRef(file)));
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} else if (optionsMatch(options.prefetch, file)) {
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hints.push(createResourceHint('prefetch', getRef(file)));
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}
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});
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return hints;
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};
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const isInitial = chunk =>
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chunk.canBeInitial
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? chunk.canBeInitial()
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: chunk.isInitial
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? chunk.isInitial()
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: chunk.isInitial;
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const optionsMatch = (option, file) => {
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return matches(option.chunks, CHUNK_OPTIONS) && matches(file, option.test);
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};
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const generateRef = options => {
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const publicPath = getPublicPath(options);
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return publicPath
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? file => publicPath + file
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: file => file;
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};
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module.exports = addAsyncChunkResourceHints;
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