52 lines
1.9 KiB
JavaScript
52 lines
1.9 KiB
JavaScript
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/* This loader renders the template with underscore if no other loader was found */
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'use strict';
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var _ = require('lodash');
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var loaderUtils = require('loader-utils');
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module.exports = function (source) {
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if (this.cacheable) {
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this.cacheable();
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}
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var allLoadersButThisOne = this.loaders.filter(function (loader) {
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// Loader API changed from `loader.module` to `loader.normal` in Webpack 2.
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return (loader.module || loader.normal) !== module.exports;
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});
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// This loader shouldn't kick in if there is any other loader
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if (allLoadersButThisOne.length > 0) {
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return source;
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}
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// Skip .js files
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if (/\.js$/.test(this.resourcePath)) {
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return source;
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}
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// The following part renders the tempalte with lodash as aminimalistic loader
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//
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// Get templating options
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var options = loaderUtils.parseQuery(this.query);
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// Webpack 2 does not allow with() statements, which lodash templates use to unwrap
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// the parameters passed to the compiled template inside the scope. We therefore
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// need to unwrap them ourselves here. This is essentially what lodash does internally
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// To tell lodash it should not use with we set a variable
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var template = _.template(source, _.defaults(options, { variable: 'data' }));
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// All templateVariables which should be available
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// @see HtmlWebpackPlugin.prototype.executeTemplate
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var templateVariables = [
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'compilation',
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'webpack',
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'webpackConfig',
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'htmlWebpackPlugin'
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];
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return 'var _ = require(' + loaderUtils.stringifyRequest(this, require.resolve('lodash')) + ');' +
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'module.exports = function (templateParams) {' +
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// Declare the template variables in the outer scope of the
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// lodash template to unwrap them
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templateVariables.map(function (variableName) {
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return 'var ' + variableName + ' = templateParams.' + variableName;
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}).join(';') + ';' +
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// Execute the lodash template
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'return (' + template.source + ')();' +
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'}';
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};
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