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elm — Compile and run Elm source files. More information: <https://guide.elm-lang.org/install/elm.html>.

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandrunandelmcompilesourcecli

Problem

How to use the elm command: Compile and run Elm source files. More information: <https://guide.elm-lang.org/install/elm.html>.

Solution

elm — Compile and run Elm source files. More information: <https://guide.elm-lang.org/install/elm.html>.

Initialize an Elm project, generates an elm.json file:

elm init

Start interactive Elm shell:

elm repl

Compile an Elm file, output the result to an index.html file:

elm make {{source}}

Compile an Elm file, output the result to a JavaScript file:

elm make {{source}} --output={{destination}}.js

Start local web server that compiles Elm files on page load:

elm reactor

Install Elm package from <https://package.elm-lang.org>:

elm install {{author}}/{{package}}

Code Snippets

Initialize an Elm project, generates an elm.json file

elm init

Start interactive Elm shell

elm repl

Compile an Elm file, output the result to an `index.html` file

elm make {{source}}

Compile an Elm file, output the result to a JavaScript file

elm make {{source}} --output={{destination}}.js

Start local web server that compiles Elm files on page load

elm reactor

Context

tldr-pages: common/elm

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