Allow transform-runtime to insert runtime references with absolute paths.#8435
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loganfsmyth merged 1 commit intobabel:masterfrom Aug 14, 2018
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| function resolveAbsoluteRuntime(moduleName: string, dirname: string) { | ||
| try { | ||
| return path.dirname( | ||
| resolve.sync(`${moduleName}/package.json`, { basedir: dirname }), |
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Why do we need to look for package.json?
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The runtime doesn't have a main or index because it's meant to be a collection of independent files. Since we want to resolve the directory location though, we do need a specific file to resolve, and package.json fits those requirements well.
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This allows users to run
transform-runtimebroadly across a whole project. By default,transform-runtimeimports from@babel/runtime/foodirectly, but that only works if@babel/runtimeis in the node modules of the file that is being compiled. This can be problematic for nested node modules, or npm-linked modules, among other cases. To avoid worrying about how the runtime module's location, this allows users to resolve the runtime once up front, and then insert absolute paths to the runtime into the output code.Using absolute paths is not desirable if files are compiled for use at a later time, but in contexts where a file is compiled and then immediately consumed, they can be quite helpful.
This PR exposes two approaches for resolving the runtime:
absoluteRuntime: true- Resolve the runtime:cwdif thetransform-runtimeplugin is passed as a programmatic arg to Babeltransform-runtimeis enabled via a config fileabsoluteRuntime: '/projects/thing/src'__dirnameof some general build process script. e.g. will look at/projects/thing/src/node_modules/@babel/runtime/foo/projects/thing/node_modules/@babel/runtime/foo/projects/node_modules/@babel/runtime/foo/node_modules/@babel/runtime/foocc @insin