Function findApplicableIndexInfo

test/fixtures/snapshot/typescript.js:59447–59473

(indexInfos, keyType)

            return ts.find(indexInfos, function (info) { return info.keyType === keyType; });
        }
        function findApplicableIndexInfo(indexInfos, keyType) {
            // Index signatures for type 'string' are considered only when no other index signatures apply.
            var stringIndexInfo;
            var applicableInfo;
            var applicableInfos;
            for (var _i = 0, indexInfos_3 = indexInfos; _i < indexInfos_3.length; _i++) {
                var info = indexInfos_3[_i];
                if (info.keyType === stringType) {
                    stringIndexInfo = info;
                }
                else if (isApplicableIndexType(keyType, info.keyType)) {
                    if (!applicableInfo) {
                        applicableInfo = info;
                    }
                    else {
                        (applicableInfos || (applicableInfos = [applicableInfo])).push(info);
                    }
                }
            }
            // When more than one index signature is applicable we create a synthetic IndexInfo. Instead of computing
            // the intersected key type, we just use unknownType for the key type as nothing actually depends on the
            // keyType property of the returned IndexInfo.
            return applicableInfos ? createIndexInfo(unknownType, getIntersectionType(ts.map(applicableInfos, function (info) { return info.type; })), ts.reduceLeft(applicableInfos, function (isReadonly, info) { return isReadonly && info.isReadonly; }, /*initial*/ true)) :
                applicableInfo ? applicableInfo :
                    stringIndexInfo && isApplicableIndexType(keyType, stringType) ? stringIndexInfo :
                        undefined;
        }
        function isApplicableIndexType(source, target) {
            // A 'string' index signature applies to types assignable to 'string' or 'number', and a 'number' index
            // signature applies to types assignable to 'number', `${number}` and numeric string literal types.