[heft] Add .d.ts shims for secondary module kinds #3539
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Summary
Modifies the multi-emit logic for the Heft TypeScript plugin to generate
.d.ts
shim files for non-primary output kinds, that redirect to the primary .d.ts files.Details
Creates shim files containing:
The motivation is to better support separation of transpilation and type-checking by having the transpilation step emit
.d.ts
stubs that can be trivially generated from the source files in an isolated per-module fashion, which at generation time may point to a declaration file that does not yet exist. The real declaration files would be generated later, during type-checking, so that downstream packages can still type-check correctly, even with deep imports.How it was tested
Enabled multi-emit and isolatedModules in the node rig temporarily. Verified output content.