@glimmer/util
Version:
Common utilities used in Glimmer
40 lines (30 loc) • 3.54 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = buildUntouchableThis;
var _env = require("@glimmer/env");
var _platformUtils = require("./platform-utils");
function buildUntouchableThis(source) {
let context = null;
if (_env.DEBUG && _platformUtils.HAS_NATIVE_PROXY) {
let assertOnProperty = property => {
throw new Error(`You accessed \`this.${String(property)}\` from a function passed to the ${source}, but the function itself was not bound to a valid \`this\` context. Consider updating to use a bound function (for instance, use an arrow function, \`() => {}\`).`);
};
context = new Proxy({}, {
get(_target, property) {
assertOnProperty(property);
},
set(_target, property) {
assertOnProperty(property);
return false;
},
has(_target, property) {
assertOnProperty(property);
return false;
}
});
}
return context;
}
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