![]() ![]() The problem can be seen in the snippet above, the types field is where he tells TSC where the declaration file is when the package is imported as a module, the problem is, as I pointed out above, the package is defaulting to resolve as a CJS module, despite defining an ESM entry point. He could have done it the other way around, but he didn't, he did it the way you see above. "require": "./base64.js" // CJS entry point "import": "./base64.mjs", // ESM entry point That is this bit of JSON-Code here: "types": "base64.d.ts", The important thing to note is that the package-maintainer used the package.json file's "exports" field to define separate entry points for the two module types. This is because much of the support for ESM is new, despite the ESM standard being included in the ECMA-262 specification back in 2015. The package.json file's "type" field can be set to either.Īs stated above, omitting the "type" field results in the package resolving as a CJS module.Ĭonfiguring modules for ESM, especially when attempting to support CJS at the same time, has become a very complex ordeal, and currently is not understood by many when it pertains to TypeScript written packages. The base package.json file doesn't contain a "type" field, therefore it defaults to a CJS module. The package is configured, by default, to resolve as a "Common-JS Module". It isn't resolving because of how it has been configured. Either way, it does have a properly TSC emitted. I havn't inspected its code thoroughly but I wouldn't be surprised if it use to be pure JS, and was converted at some point to TS. In this case, the package is defiantly a TS authored package. So, the package is written in TypeScript, generally a bi-modular package will be written in TypeScript, or at the very least, transpilled using some transpiler. Why won't the Types Resolve? Are they not included in the base64.d.ts file? Those trying to import the package using TypeScript - in an ESM environment - will get type errors, and they should notice that the package is not resolving with types. js-base64/package.json: from 'js-base64' &/or a require('js-base64') statement and everything should resolve being typed. The question above asks about a package.json file, that AToW (at the time of writing) was configured like this. Then the error goes away which suggests to me that. However, if I do $ ln -s node_modules/js-base64/base64.d.ts node_modules/js-base64/base64.d.mts '/myproj/node_modules/js-base64/base64.mjs' implicitly has an 'any' type Then when I try to import it like // myfile.tsĬould not find a declaration file for module 'js-base64'. Can this be resolved without modifying the package?įor a project that has ESM enabled via the following configs // package.json ![]() d.mts which is problematic if you don't own the imported module. What are the resolution rules in this case? It seems. mjs versions of implementation but just the. Not all packages fit the above categories. With the new ESM file extensions there are two straightforward kinds of modules: If a project has it enabled this, TS compiler has more complexity to manage when it does module resolution (locates the files to import). With ECMAScript Module support added in Typescript 4.7, several new file extensions may get involved during a TS build including. ![]()
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