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@jsenv/import-map
Advanced tools
Helpers to implement importmaps.
@jsenv/import-map
can be used to implement the behaviour of importmap as described in the specification. It is written using es modules and compatible with browsers and Node.js. For instance, this repository is used to make ESLint compatible with importmaps.
npm install @jsenv/import-map
composeTwoImportMaps
takes two importMap
and return a single importMap
being the composition of the two.
import { composeTwoImportMaps } from "@jsenv/import-map"
const importMap = composeTwoImportMaps(
{
imports: {
foo: "bar",
},
},
{
imports: {
foo: "whatever",
},
},
)
console.log(JSON.stringify(importMap, null, " "))
{
"imports": {
"foo": "whatever"
}
}
— source code at src/composeTwoImportMaps.js.
normalizeImportMap
returns an importMap
resolved against an url
and sorted.
import { normalizeImportMap } from "@jsenv/import-map"
const importMap = normalizeImportMap(
{
imports: {
foo: "./bar",
"./ding.js": "./dong.js"
},
},
"http://your-domain.com",
)
console.log(JSON.stringify(importMap, null, ' ')
{
"imports": {
"foo": "http://your-domain.com/bar",
"http://your-domain.com/ding.js": "http://your-domain.com/dong.js"
}
}
— source code at src/normalizeImportMap.js.
resolveImport
returns an import url
applying an importMap
to specifier
and importer
. The provided importMap
must be resolved and sorted to work as expected. You can use normalizeImportMap to do that.
import { resolveImport } from "@jsenv/import-map"
const importUrl = resolveImport({
specifier: "../index.js",
importer: "http://domain.com/folder/file.js",
importMap: {
imports: {
"http://domain.com/index.js": "http://domain.com/main.js",
},
},
})
console.log(importUrl)
http://domain.com/main.js
— source code at src/resolveImport.js.
moveImportMap
receives importMap
, fromUrl
, toUrl
and return an importmap where all relative urls and specifiers becomes relative to toUrl
instead of fromUrl
.
This function exists in case you need to move an importmap file somewhere else in the filesystem. This is not a common use case but might happen.
import { moveImportMap } from "@jsenv/import-map"
const importMapMoved = moveImportMap(
{
imports: {
foo: "./foo.js",
},
},
"file:///project/project.importmap",
"file:///project/dir/project.importmap",
)
console.log(JSON.stringify(importMap, null, ' ')
{
"imports": {
"foo": "../foo.js",
}
}
— source code at src/moveImportMap.js.
FAQs
Helpers to implement importmaps.
The npm package @jsenv/import-map receives a total of 349 weekly downloads. As such, @jsenv/import-map popularity was classified as not popular.
We found that @jsenv/import-map demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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