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loader.ts
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loader.ts
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import { optimize, loadConfig } from 'svgo';
import { validate } from 'schema-utils';
import unTypedSchemaOptions from './schemas/loader-options.json' assert { type: 'json' };
import { Schema } from 'schema-utils/declarations/validate.js';
import { LoaderThis, LoaderOptions } from './types.js';
import { PACKAGE_NAME } from './utils.js';
const schemaOptions = unTypedSchemaOptions as Schema;
/**
* Loader for SVG files
* Content are not edited, just stringified
* The plugin create sprites
*/
export default async function SvgChunkWebpackLoader(
this: LoaderThis,
content: string
): Promise<string> {
const options: LoaderOptions = this.getOptions() || {};
validate(schemaOptions, options, {
name: 'SvgChunkWebpackPlugin Loader',
baseDataPath: 'options'
});
const compiler = this._compiler;
const callback = this.async();
// Check if the plugin is also imported
const plugin = compiler.options.plugins.find(
(plugin: any) => plugin.PLUGIN_NAME && plugin.PLUGIN_NAME === PACKAGE_NAME
);
if (typeof plugin === 'undefined') {
return callback(new Error(`${PACKAGE_NAME} requires the corresponding plugin`));
}
// Check if content is a SVG file
if (!content.includes('<svg')) {
return callback(new Error(`${PACKAGE_NAME} exception. ${content}`));
}
// Declare all SVG files as side effect
// https://github.com/webpack/webpack/issues/12202#issuecomment-745537821
this._module.factoryMeta = this._module.factoryMeta || {};
this._module.factoryMeta.sideEffectFree = false;
// Flag all SVG files to find them more easily on the plugin side
this._module.buildInfo.SVG_CHUNK_WEBPACK_PLUGIN = true;
try {
const { configFile } = options;
let config;
if (typeof configFile === 'string') {
try {
config = await loadConfig(configFile, this.context);
} catch (error) {
this.emitError(new Error(`Cannot find module ${configFile}`));
}
} else if (configFile !== false) {
config = await loadConfig(null, this.context);
}
const result = await optimize(content, { ...config });
return callback(null, JSON.stringify(result.data));
} catch (error) {
return callback(error);
}
}