Uncaught TypeError: Cannot read properties of undefined (reading 'RΦ')

[khusamov]

The following example does not work on Rollup.js

import "reflect-metadata"
import {reflect, CallSite} from 'typescript-rtti'

function foo<T>(num : number, callSite? : CallSite) {
	if (!callSite) throw 'callSite is undefined'
	console.log(
		reflect(callSite)
			.typeParameters[0]
			.isClass(Boolean),
		// => true

		reflect(callSite)
			.parameters[0]
			.isClass(Number),
		// => true

		reflect(callSite)
			.parameters[0]
			.is('literal'),
		// => true

		reflect(callSite)
			.parameters[0].as('literal')
			.value
		// => 123
	)
}

foo<Boolean>(123);

Error text:

index.js:18 Uncaught TypeError: Cannot read properties of undefined (reading 'RΦ')
    at Object.a (index.js:18:1)
    at foo (index.ts:17:20)
    at index.ts:39:1

[rezonant]

Works in the playground, so it must be rollup-specific: https://typescript-rtti.org/#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

[rezonant]

Reproduction: https://github.com/typescript-rtti/typescript-rtti-issue-48

[rezonant]

Gist with emitted bundle: https://gist.github.com/rezonant/e0f9289538bd370496988f877c08b025

[rezonant]

Comes down to this: Here, the CallSite interface does not have an emitted token, so dist["IΦCallSite"] will be undefined. This isn't likely specific to rollup, as it turns out.

[91]: { LΦ: t => dist["IΦCallSite"] }

It works in the playground because the actual typescript-rtti library code is not reachable by TS, so an T_ANY (~) type reference is emitted in its place:

[79]: { RΦ: t => ({ TΦ: "~" }) }

This would not be true outside of the Playground.

[rezonant]

The fix will be released as 0.5.6 once the corpus test suite passes

EDIT: This is now released