type-is.ts

/** Returns a list of the type's flags. */
function typeIs(type: tsMorph.Type) {
  return Object.entries({
    Anonymous: type.isAnonymous(),
    Array: type.isArray(),
    Boolean: type.isBoolean() || type.isBooleanLiteral(),
    String: type.isString() || type.isStringLiteral(),
    Number: type.isNumber() || type.isNumberLiteral(),
    BigInt: type.isBigInt() || type.isBigIntLiteral(),
    Symbol: isSymbolType(type),
    Undefined: type.isUndefined(),
    Void: type.isVoid(),
    Object: type.isObject(),
    Intersection: type.isIntersection(),
    Union: type.isUnion(),
    Literal: type.isLiteral(),
    Tuple: type.isTuple(),
    Unknown: type.isUnknown(),
    Never: type.isNever(),
    Any: type.isAny(),
    Null: type.isNull(),
    Interface: type.isInterface(),
    Enum: type.isEnum() || type.isEnumLiteral(),
    Reference: isReferenceType(type),
    TypeParameter: type.isTypeParameter(),
    MappedType: isMappedType(type),
    IndexedAccess: isIndexedAccessType(type),
    ConditionalType: isConditionalType(type),
  })
    .filter((entry) => entry.at(1))
    .map((entry) => entry.at(0))
    .join(', ')
}