esm-loader-import-meta-custom
v1.0.6
Published
Chainable ESModule Loader to stub custom import.meta.* properties
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esm-loader-import-meta-custom
Node.js ESModule Loader to stub custom import.meta.*
properties.
This loader will ignore any valid import.meta
properties, such as:
import.meta.resolve
import.meta.url
Warning! Using experimental Node.js features and flags, API will likely change. This may be helpful for development and testing, but should not be used in production.
Usage
Some web frameworks will override import.meta
with custom properties, not
known to Node.js. Your production web code might contain something like this:
// index.js
const dbUrl = import.meta.env.VITE_DATABASE_URL
If you try testing this web code in isolation under Node.js it will fail, as
Node does not recoginze import.meta.env*
.
Chainable
This loader can be configured, and chained with other loaders, using node-esm-loader.
npm install --save-dev esm-loader-import-meta-custom node-esm-loader
// .loaderrc.js
export default {
loaders: [
{
loader: 'esm-loader-import-meta-custom',
options: {
meta: {
env: {
VITE_DATABASE_URL: 'postgres://user@localhost/db',
},
},
},
},
],
}
# node >= 20.7
NODE_OPTIONS="--import node-esm-loader/register" node index.js
# node < 20.7
NODE_OPTIONS="--loader node-esm-loader" node index.js
Options
Meta
See example above.
Debug
// .loaderrc.js
export default {
loaders: [
{
loader: 'esm-loader-import-meta-custom',
options: {
debug: true,
},
},
],
}