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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.
— see importMap spec
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 40 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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