dictionarytest.ts

import { TaskEither } from "fp-ts/lib/TaskEither";
import * as ts from "typescript";

type SyntaxKindToValueType = {
  [ts.SyntaxKind.StringLiteral]: string;
  [ts.SyntaxKind.NumericLiteral]: number;
};

type NumericStringToNumer<N extends string> = ({
    "8": 8
  "9": 9;
} & { [K: string]: never })[N];
type NumerToNumericString<N extends number> = ({
   8: "8",
   9:"9"
} & { [K: number]: never })[N];

type SupportedNodes = { kind: keyof SyntaxKindToValueType };

type IExecutionContext = {};

declare function compileNode<K extends NumericStringToNumer<keyof SyntaxKindToValueType>>(
  node: { kind: K } & ts.Node
): (x: IExecutionContext) => TaskEither<never, SyntaxKindToValueType[NumerToNumericString<K>]>;

const shouldBeString = compileNode((1 as any) as ts.StringLiteral);
const shouldBeNumber = compileNode((1 as any) as ts.NumericLiteral);