33 lines
1.2 KiB
JavaScript
33 lines
1.2 KiB
JavaScript
"use strict";
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var isValue = require("type/value/is")
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, ensureValue = require("type/value/ensure")
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, ensurePlainFunction = require("type/plain-function/ensure")
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, copy = require("es5-ext/object/copy")
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, normalizeOptions = require("es5-ext/object/normalize-options")
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, map = require("es5-ext/object/map");
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var bind = Function.prototype.bind
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, defineProperty = Object.defineProperty
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, hasOwnProperty = Object.prototype.hasOwnProperty
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, define;
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define = function (name, desc, options) {
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var value = ensureValue(desc) && ensurePlainFunction(desc.value), dgs;
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dgs = copy(desc);
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delete dgs.writable;
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delete dgs.value;
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dgs.get = function () {
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if (!options.overwriteDefinition && hasOwnProperty.call(this, name)) return value;
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desc.value = bind.call(value, options.resolveContext ? options.resolveContext(this) : this);
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defineProperty(this, name, desc);
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return this[name];
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};
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return dgs;
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};
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module.exports = function (props/*, options*/) {
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var options = normalizeOptions(arguments[1]);
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if (isValue(options.resolveContext)) ensurePlainFunction(options.resolveContext);
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return map(props, function (desc, name) { return define(name, desc, options); });
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};
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