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https://github.com/vercel-labs/scriptc.git
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Chris Tate
f291f1c275
A package function that destructures its options object, such as
makeClass({ Base, name }), now specializes per call site like positional
parameters: each destructured name binds the static type of the matching
property, so a class passed as { Base } keeps its static type and
class extends Base builds a constructible subclass.
Fixes #938
Co-authored-by: phall <25888173+phall1@users.noreply.github.com>
32 lines
923 B
JavaScript
32 lines
923 B
JavaScript
// A class factory that takes its base and settings as one options object,
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// as Effect's makeClass does: `makeClass({ Base, name })` destructures them
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// and builds `class extends Base`.
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function makeClass({ Base, name, tag: label }) {
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return class extends Base {
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constructor(value) {
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super(value);
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this.kind = name;
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this.label = label;
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}
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describe() {
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return `${this.label}:${this.kind}:${this.value}`;
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}
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// Each class passes itself back as a base: a call site must not
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// specialize makeClass on the classes makeClass itself defines.
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static extend(name) {
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return makeClass({ Base: this, name, tag: label });
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}
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};
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}
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class Root {
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constructor(value) {
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this.value = value;
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}
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}
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export function Class(name) {
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return makeClass({ Base: Root, name, tag: "root" });
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}
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export function extend(Base, name) {
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return makeClass({ Base, name, tag: "sub" });
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}
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