Christopher Chedeau
cf45afba61
- This brings in the flow test suite that contains a ton of JavaScript parsing edge cases - This creates snapshot tests using the pretty printer for all of them - If uncomment `RUN_AST_TESTS` line in `tests/run_specs.js`, it checks ast(pretty_print(x)) == ast(x). Right now, "178 failed, 197 passed, 375 of 377 total". So half of the tests are not passing, most of them are crashes and many of the rest are subtle issues.
74 lines
1.4 KiB
JavaScript
74 lines
1.4 KiB
JavaScript
// @flow
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function is_string(y): %checks {
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return typeof y === "string";
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}
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function is_bool(y): %checks {
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return typeof y === "boolean";
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}
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function is_number(y): %checks {
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return typeof y === "number";
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}
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// Feature check:
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function foo(x: string | Array<string>): string {
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if (is_string(x)) {
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// The use of `is_string` as a conditional check
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// should guarantee the narrowing of the type of `x`
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// to string.
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return x;
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} else {
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// Accordingly the negation of the above check
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// guarantees that `x` here is an Array<string>
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return x.join();
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}
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}
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// Same as above but refining an offset
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function bar(z: { f: string | Array<string>}): string {
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if (is_string(z.f)) {
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return z.f;
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} else {
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return z.f.join();
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}
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}
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function is_number_or_bool(y): %checks {
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return is_number(y) || is_bool(y);
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}
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function baz(z: string | number): number {
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if (is_number_or_bool(z)) {
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return z;
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} else {
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return z.length;
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}
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}
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// Feature: multi params
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function multi_param(w,x,y,z): %checks {
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return typeof z === "string";
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}
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function foo(x: string | Array<string>): string {
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if (multi_param("1", "2", "3", x)) {
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return x;
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} else {
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return x.join();
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}
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}
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function foo(a, b) {
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if (two_strings(a, b)) {
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from_two_strings(a, b);
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}
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}
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function two_strings(x,y): %checks {
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return is_string(x) && is_string(y) ;
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}
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declare function from_two_strings(x: string, y: string): void;
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