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Make Structures.extend static and tweak error messages

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This commit is contained in:
Schuyler Cebulskie
2017-11-19 22:46:38 -05:00
parent 47dc8fd046
commit 6d53d893a8
1 changed files with 4 additions and 4 deletions
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8
src/util/Structures.js
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@@ -24,19 +24,19 @@ class Structures {
* }
* );
*/
extend(name, extender) {
static extend(name, extender) {
if (!structures[name]) throw new RangeError(`"${name}" is not a valid extensible structure.`);
if (typeof extender !== 'function') {
throw new TypeError('The extender must be a function that returns the extended class.');
throw new TypeError('The extender must be a function that returns the extended structure class/prototype.');
}
const custom = extender(structures[name]);
if (typeof custom !== 'function') {
throw new TypeError('The extender function should return the extended class/prototype.');
throw new TypeError('The extender function must return the extended structure class/prototype.');
}
if (Object.getPrototypeOf(custom) !== structures[name]) {
throw new Error(
'The class/prototype returned from the extender function must extend the existing structure class/prototype.'
"The class/prototype returned from the extender function doesn't extend the existing structure class/prototype."
);
}