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Check if t.is is already defined (specifically accounting for the isImmutable method in validators

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This commit is contained in:
Henry Zhu 2016-04-16 18:27:55 -04:00
parent c9e5da6ad0
commit 6f5e47eff0
1 changed files with 6 additions and 3 deletions
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9
packages/babel-types/src/index.js
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@ -12,9 +12,12 @@ let t = exports;
*/
function registerType(type: string) {
let is = t[`is${type}`] = function (node, opts) {
return t.is(type, node, opts);
};
let is = t[`is${type}`];
if (!is) {
is = t[`is${type}`] = function (node, opts) {
return t.is(type, node, opts);
};
}
t[`assert${type}`] = function (node, opts) {
opts = opts || {};