feat: Precisely reflect the type of an implementation at runtime (!!)

This commit is contained in:
Glen Whitney 2023-08-18 10:57:30 -07:00
parent 180e772dab
commit 770c302342
6 changed files with 192 additions and 2 deletions

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@ -8,3 +8,7 @@ Convenience scripts:
* `pnpm build` -- compile the package
* `pnpm exec` -- run the compiled code produced by `pnpm build`
* `pnpm go` -- both of the above in sequence.
Important installation note:
after `pnpm install`, you must execute `npx ts-patch install` to activate the ts-macros compiler plugin.

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@ -24,6 +24,8 @@
devDependencies: {
'@types/node': '^20.5.0',
'source-map': '^0.7.4',
'ts-macros': '^2.3.1',
'ts-patch': '^3.0.2',
typescript: '^5.1.6',
},
}

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@ -11,6 +11,12 @@ devDependencies:
source-map:
specifier: ^0.7.4
version: 0.7.4
ts-macros:
specifier: ^2.3.1
version: 2.3.1(typescript@5.1.6)
ts-patch:
specifier: ^3.0.2
version: 3.0.2
typescript:
specifier: ^5.1.6
version: 5.1.6
@ -21,13 +27,170 @@ packages:
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@ -1,7 +1,22 @@
import type {Dependencies, Signature} from '../interfaces/type.js'
import {$$typeToString} from 'ts-macros'
export const square =
<T>(dep: Dependencies<'multiply', T>): Signature<'square', T> =>
z => dep.multiply(z, z)
// z => dep.fooBar(z, z) // fails as desired
// z => dep.multiply(z, 'foo') // fails as desired
// z => dep.multiply(z, 'foo') // still fails as desired
// make sure ts-macros is running
function $contains<T>(value: T, ...possible: Array<T>) {
// repetition which goes over all the elements in the "possible" array
return +["||", [possible], (item: T) => value === item];
}
const searchItem = "needle";
console.log("In generic arithmetic")
console.log($contains!(searchItem, "erwin", "tj"));
// Transpiles to: console.log(false);
// OK, record the type of square:
square.reflectedType = $$typeToString!<typeof square>();

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@ -18,3 +18,6 @@ const myabs = quatAbsquare({re: {re: 0, im: 1}, im: {re:2, im: 3}})
const typeTest: typeof myabs = 7 // check myabs is just a number
console.log('Result is', myabs)
// Check type of the generic square implementation
console.log('Type of square is', Specifications.generic.square.reflectedType)

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@ -3,6 +3,9 @@
"target": "ES2022",
"rootDir": "./src",
"outDir": "./build",
"moduleResolution": "nodenext"
"moduleResolution": "nodenext",
"plugins": [
{"transform": "ts-macros" }
]
}
}