cache-loader
Caches the result of following loaders on disk (default) or in the database
安装
npm install --save-dev cache-loader
用法
在一些性能开销较大的 loader 之前添加此 loader，以将结果缓存到磁盘里。
webpack.config.js
module.exports = {
module: {
rules: [
{
test: /\.ext$/,
use: [
'cache-loader',
...loaders
],
include: path.resolve('src')
}
]
}
}
⚠️ 请注意，保存和读取这些缓存文件会有一些时间开销，所以请只对性能开销较大的 loader 使用此 loader。
Options
Name
Type
Default
Description
Name
cacheKey
Type
{Function(options, request) -> {String}}
Default
undefined
Description
Allows you to override default cache key generator
Name
cacheDirectory
Type
{String}
Default
path.resolve('.cache-loader')
Description
Provide a cache directory where cache items should be stored (used for default read/write implementation)
Name
cacheIdentifier
Type
{String}
Default
cache-loader:{version} {process.env.NODE_ENV}
Description
Provide an invalidation identifier which is used to generate the hashes. You can use it for extra dependencies of loaders (used for default read/write implementation)
Name
write
Type
{Function(cacheKey, data, callback) -> {void}}
Default
undefined
Description
Allows you to override default write cache data to file (e.g. Redis, memcached)
Name
read
Type
{Function(cacheKey, callback) -> {void}}
Default
undefined
Description
Allows you to override default read cache data from file
示例
webpack.config.js
module.exports = {
module: {
rules: [
{
test: /\.js$/,
use: [
'cache-loader',
'babel-loader'
],
include: path.resolve('src')
}
]
}
}
##
webpack.config.js
// Or different database client - memcached, mongodb, ...
const redis = require('redis');
const crypto = require('crypto');
// ...
// connect to client
// ...
const BUILD_CACHE_TIMEOUT = 24 * 3600; // 1 day
function digest(str) {
return crypto.createHash('md5').update(str).digest('hex');
}
// Generate own cache key
function cacheKey(options, request) {
return `build:cache:${digest(request)}`;
}
// Read data from database and parse them
function read(key, callback) {
client.get(key, (err, result) => {
if (err) {
return callback(err);
}
if (!result) {
return callback(new Error(`Key ${key} not found`));
}
try {
let data = JSON.parse(result);
callback(null, data);
} catch (e) {
callback(e);
}
});
}
// Write data to database under cacheKey
function write(key, data, callback) {
client.set(key, JSON.stringify(data), 'EX', BUILD_CACHE_TIMEOUT, callback);
}
module.exports = {
module: {
rules: [
{
test: /\.js$/,
use: [
{
loader: 'cache-loader',
options: {
cacheKey,
read,
write,
}
},
'babel-loader'
],
include: path.resolve('src')
}
]
}
}
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