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Recommended tsconfig.json target option for Node 14 is ES2020 which is not fully supported by Node 14. Β· Issue #46325 Β· microsoft/TypeScript Β· GitHub
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DocsThe issue relates to how you learn TypeScriptThe issue relates to how you learn TypeScript
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π Search Terms
node 14, tsconfig.json, es2020, recommended
Problem
According to the Node Target Mapping wiki page the recommended tsconfig.json
for Node 14 is:
{
"compilerOptions": {
"lib": ["ES2020"],
"module": "commonjs",
"target": "ES2020"
}
}
However, if we look at the node.green ES2020 feature support table we will see that Node 14 does not support one feature of ES2020 which is "spread parameters after optional chaining".
β― Playground Link
Playground link with relevant code
π» Code
input.ts
:
type Fn = ((...args: unknown[]) => void) | null;
type O = { method?: (...args: unknown[]) => void };
type N = { method: (...args: unknown[]) => void } | null;
var fn: Fn = null;
var n: N = null;
var o: O = {};
function func(fn: Fn, n: N, o: O) {
return (
fn?.(...[], 1) === void undefined &&
fn?.(...[], ...[]) === void undefined &&
o.method?.(...[], 1) === void undefined &&
n?.method(...[], 1) === void undefined
);
}
console.log(func(fn, n, o));
Output JavaScript:
"use strict";
var fn = null;
var n = null;
var o = {};
function func(fn, n, o) {
return (fn?.(...[], 1) === void undefined &&
fn?.(...[], ...[]) === void undefined &&
o.method?.(...[], 1) === void undefined &&
n?.method(...[], 1) === void undefined);
}
console.log(func(fn, n, o));
π Actual behavior
/Users/antonsavcenko/Development/misc/typescript/src/index.js:5
return (fn?.(...[], 1) === void undefined &&
^
TypeError: Function.prototype.apply was called on null, which is a object and not a function
at func (/Users/antonsavcenko/Development/misc/typescript/src/index.js:5:5)
at Object.<anonymous> (/Users/antonsavcenko/Development/misc/typescript/src/index.js:10:13)
at Module._compile (internal/modules/cjs/loader.js:1072:14)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1101:10)
at Module.load (internal/modules/cjs/loader.js:937:32)
at Function.Module._load (internal/modules/cjs/loader.js:778:12)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:76:12)
at internal/main/run_main_module.js:17:47
π Expected behavior
true
IllusionMH
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