andrewbranch/Module resolvers.md Secret

## Module resolvers.md

      
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              Module resolvers.md
            
          
Resolver
Conditional imports
Directory index files
Extensions omitable
Extensions omitted in JS by convention
Extensions omitted in TS by convention
Resolves .ts extension to .ts
Resolves .js extension to .ts
Import ESM
Import CJS
Notes


Vite
yes
yes
yes
no
yes
yes
yes
yes
yes


Parcel
no
yes
yes
yes
yes
yes
no
yes
yes


esbuild
yes
yes
yes
?
?
yes
yes
yes
yes


Webpack
yes (as of v5)
yes
yes
yes
yes
yes
with plugin
yes
yes


Rollup
with node plugin
with ts plugin
yes
no
?
no
with ts plugin
yes
yes
ts plugin uses ts.nodeModuleNameResolver


Node 10
no
yes
yes
yes
-
yes
no
no
yes


Deno
yes
no
no
-
-
yes
no
yes
no


Browsers
no
no
no
-
-
yes
no
yes
no


tsc --moduleResolution node
no
yes
yes
yes
yes
no
yes
yes
yes


Node 12+ (from CJS)
yes
yes
yes
yes
-
yes
no
async
yes


tsc --moduleResolution nodenext (from CJS)
yes
yes
yes
yes
yes
no
yes
async
yes


Node 12+ (from ESM)
yes
no
no
-
-
yes
no
yes
yes


tsc --moduleResolution nodenext (from ESM)
yes
no
no
-
-
no
yes
yes
yes
Resolver	Conditional imports	Directory index files	Extensions omitable	Extensions omitted in JS by convention	Extensions omitted in TS by convention	Resolves .ts extension to .ts	Resolves .js extension to .ts	Import ESM	Import CJS	Notes
Vite	yes	yes	yes	no	yes	yes	yes	yes	yes
Parcel	no	yes	yes	yes	yes	yes	no	yes	yes
esbuild	yes	yes	yes	?	?	yes	yes	yes	yes
Webpack	yes (as of v5)	yes	yes	yes	yes	yes	with plugin	yes	yes
Rollup	with node plugin	with ts plugin	yes	no	?	no	with ts plugin	yes	yes	ts plugin uses ts.nodeModuleNameResolver
Node 10	no	yes	yes	yes	-	yes	no	no	yes
Deno	yes	no	no	-	-	yes	no	yes	no
Browsers	no	no	no	-	-	yes	no	yes	no
`tsc --moduleResolution node`	no	yes	yes	yes	yes	no	yes	yes	yes
Node 12+ (from CJS)	yes	yes	yes	yes	-	yes	no	async	yes
`tsc --moduleResolution nodenext` (from CJS)	yes	yes	yes	yes	yes	no	yes	async	yes
Node 12+ (from ESM)	yes	no	no	-	-	yes	no	yes	yes
`tsc --moduleResolution nodenext` (from ESM)	yes	no	no	-	-	no	yes	yes	yes