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fix: reduce number of require for url
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@alexander-akait
alexander-akait committed Dec 5, 2018
1 parent 533abbe commit f54eab9
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Showing 15 changed files with 427 additions and 269 deletions.
140 changes: 93 additions & 47 deletions src/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -17,14 +17,15 @@ import {
getCurrentRequest,
stringifyRequest,
} from 'loader-utils';
import camelCase from 'lodash/camelCase';

import schema from './options.json';
import { importParser, icssParser, urlParser } from './plugins';
import {
getLocalIdent,
getImportPrefix,
compileExports,
placholderRegExps,
dashesCamelCase,
} from './utils';
import Warning from './Warning';
import CssSyntaxError from './CssSyntaxError';
Expand Down Expand Up @@ -137,10 +138,9 @@ export default function loader(content, map, meta) {
.forEach((warning) => this.emitWarning(new Warning(warning)));

const messages = result.messages || [];
const { camelCase, exportOnlyLocals, importLoaders } = options;

// Run other loader (`postcss-loader`, `sass-loader` and etc) for importing CSS
const importUrlPrefix = getImportPrefix(this, importLoaders);
const importUrlPrefix = getImportPrefix(this, options.importLoaders);

// Prepare replacer to change from `___CSS_LOADER_IMPORT___INDEX___` to `require('./file.css').locals`
const importItemReplacer = (placeholder) => {
Expand All @@ -162,7 +162,7 @@ export default function loader(content, map, meta) {
const { item } = message;
const importUrl = importUrlPrefix + urlToRequest(item.url);

if (exportOnlyLocals) {
if (options.exportOnlyLocals) {
return `" + require(${stringifyRequest(
this,
importUrl
Expand All @@ -175,18 +175,65 @@ export default function loader(content, map, meta) {
)}).locals[${JSON.stringify(item.export)}] + "`;
};

let exportCode = compileExports(messages, camelCase, (valueAsString) =>
valueAsString.replace(placholderRegExps.importItemG, importItemReplacer)
);
const exports = messages
.filter((message) => message.type === 'export')
.reduce((accumulator, message) => {
const { key, value } = message.item;

let valueAsString = JSON.stringify(value);

valueAsString = valueAsString.replace(
placholderRegExps.importItemG,
importItemReplacer
);

function addEntry(k) {
accumulator.push(`\t${JSON.stringify(k)}: ${valueAsString}`);
}

let targetKey;

switch (options.camelCase) {
case true:
addEntry(key);
targetKey = camelCase(key);

if (targetKey !== key) {
addEntry(targetKey);
}
break;
case 'dashes':
addEntry(key);
targetKey = dashesCamelCase(key);

if (targetKey !== key) {
addEntry(targetKey);
}
break;
case 'only':
addEntry(camelCase(key));
break;
case 'dashesOnly':
addEntry(dashesCamelCase(key));
break;
default:
addEntry(key);
break;
}

return accumulator;
}, []);

if (exportOnlyLocals) {
if (options.exportOnlyLocals) {
return callback(
null,
exportCode ? `module.exports = ${exportCode};` : exportCode
exports.length > 0
? `module.exports = {\n${exports.join(',\n')}\n};`
: ''
);
}

const importCode = messages
const imports = messages
.filter((message) => message.type === 'import')
.map((message) => {
const { url } = message.item;
Expand All @@ -204,56 +251,52 @@ export default function loader(content, map, meta) {
this,
importUrl
)}), ${JSON.stringify(media)});`;
}, this)
.join('\n');
}, this);

let cssAsString = JSON.stringify(result.css).replace(
placholderRegExps.importItemG,
importItemReplacer
);

// helper for ensuring valid CSS strings from requires
let urlEscapeHelperCode = '';
// Helper for ensuring valid CSS strings from requires
let hasUrlEscapeHelper = '';

messages
.filter((message) => message.type === 'url')
.forEach((message) => {
if (!urlEscapeHelperCode) {
urlEscapeHelperCode = `var escape = require(${stringifyRequest(
this,
require.resolve('./runtime/escape.js')
)});\n`;
if (!hasUrlEscapeHelper) {
imports.push(
`var escapeUrl = require(${stringifyRequest(
this,
require.resolve('./runtime/escape-url.js')
)});`
);

hasUrlEscapeHelper = true;
}

const { item } = message;
const { url, placeholder } = item;
// Remove `#hash` and `?#hash` from `require`
const [normalizedUrl, singleQuery, hashValue] = url.split(/(\?)?#/);
const hash =
singleQuery || hashValue
? `"${singleQuery ? '?' : ''}${hashValue ? `#${hashValue}` : ''}"`
: '';

imports.push(
`var ${placeholder} = escapeUrl(require(${stringifyRequest(
this,
urlToRequest(normalizedUrl)
)})${hash ? ` + ${hash}` : ''});`
);

cssAsString = cssAsString.replace(
new RegExp(placeholder, 'g'),
() => {
// Remove `#hash` and `?#hash` from `require`
const [normalizedUrl, singleQuery, hashValue] = url.split(
/(\?)?#/
);
const hash =
singleQuery || hashValue
? `"${singleQuery ? '?' : ''}${
hashValue ? `#${hashValue}` : ''
}"`
: '';

return `" + escape(require(${stringifyRequest(
this,
urlToRequest(normalizedUrl)
)})${hash ? ` + ${hash}` : ''}) + "`;
}
() => `" + ${placeholder} + "`
);
});

if (exportCode) {
exportCode = `exports.locals = ${exportCode};`;
}

let newMap = result.map;

if (sourceMap && newMap) {
Expand Down Expand Up @@ -282,18 +325,21 @@ export default function loader(content, map, meta) {
const runtimeCode = `exports = module.exports = require(${stringifyRequest(
this,
require.resolve('./runtime/api')
)})(${!!sourceMap});`;
const moduleCode = `exports.push([module.id, ${cssAsString}, ""${
)})(${!!sourceMap});\n`;
const importCode =
imports.length > 0 ? `// Imports\n${imports.join('\n')}\n\n` : '';
const moduleCode = `// Module\nexports.push([module.id, ${cssAsString}, ""${
newMap ? `,${newMap}` : ''
}]);`;
}]);\n\n`;
const exportsCode =
exports.length > 0
? `// Exports\nexports.locals = {\n${exports.join(',\n')}\n};`
: '';

// Embed runtime
return callback(
null,
`${urlEscapeHelperCode}${runtimeCode}\n` +
`// imports\n${importCode}\n\n` +
`// module\n${moduleCode}\n\n` +
`// exports\n${exportCode}`
runtimeCode + importCode + moduleCode + exportsCode
);
})
.catch((error) => {
Expand Down
0 src/runtime/escape.js → src/runtime/escape-url.js
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File renamed without changes.
53 changes: 1 addition & 52 deletions src/utils.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,6 @@
*/
import path from 'path';

import camelCase from 'lodash/camelCase';
import loaderUtils from 'loader-utils';

const placholderRegExps = {
Expand Down Expand Up @@ -35,56 +34,6 @@ function dashesCamelCase(str) {
);
}

function compileExports(messages, camelCaseKeys, valueHandler) {
const exports = messages
.filter((message) => message.type === 'export')
.reduce((accumulator, message) => {
const { key, value } = message.item;

let valueAsString = JSON.stringify(value);

valueAsString = valueHandler(valueAsString);

function addEntry(k) {
accumulator.push(`\t${JSON.stringify(k)}: ${valueAsString}`);
}

let targetKey;

switch (camelCaseKeys) {
case true:
addEntry(key);
targetKey = camelCase(key);

if (targetKey !== key) {
addEntry(targetKey);
}
break;
case 'dashes':
addEntry(key);
targetKey = dashesCamelCase(key);

if (targetKey !== key) {
addEntry(targetKey);
}
break;
case 'only':
addEntry(camelCase(key));
break;
case 'dashesOnly':
addEntry(dashesCamelCase(key));
break;
default:
addEntry(key);
break;
}

return accumulator;
}, []);

return exports.length > 0 ? `{\n${exports.join(',\n')}\n}` : '';
}

function getLocalIdent(loaderContext, localIdentName, localName, options) {
if (!options.context) {
// eslint-disable-next-line no-param-reassign
Expand Down Expand Up @@ -112,4 +61,4 @@ function getLocalIdent(loaderContext, localIdentName, localName, options) {
.replace(/^((-?[0-9])|--)/, '_$1');
}

export { compileExports, getImportPrefix, getLocalIdent, placholderRegExps };
export { getImportPrefix, getLocalIdent, placholderRegExps, dashesCamelCase };
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