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import test from 'ava';
import delay from 'delay';
import debounceFunction from './index.js';
test('debounces a function', async t => {
let count = 0;
const debounced = debounceFunction(value => {
count++;
return value;
}, {
wait: 20,
});
t.is(debounced(1), undefined);
t.is(debounced(2), undefined);
t.is(debounced(3), undefined);
await delay(100);
t.is(debounced(4), 3);
t.is(debounced(5), 3);
t.is(debounced(6), 3);
t.is(count, 1);
await delay(200);
t.is(count, 2);
});
test('before:false after:false options', t => {
t.throws(() => {
debounceFunction(() => null, {
wait: 20,
before: false,
after: false,
});
}, {
message: 'Both `before` and `after` are false, function wouldn\'t be called.',
});
});
test('before:true after:false options', async t => {
let count = 0;
const debounced = debounceFunction(value => {
count++;
return value;
}, {
wait: 20,
before: true,
after: false,
});
t.is(debounced(1), 1);
t.is(debounced(2), 1);
t.is(debounced(3), 1);
t.is(count, 1);
await delay(100);
t.is(debounced(4), 4);
t.is(debounced(5), 4);
t.is(debounced(6), 4);
t.is(count, 2);
await delay(200);
t.is(count, 2);
});
test('before:false after:true options', async t => {
let count = 0;
const debounced = debounceFunction(value => {
count++;
return value;
}, {
wait: 20,
before: false,
after: true,
});
t.is(debounced(1), undefined);
t.is(debounced(2), undefined);
t.is(debounced(3), undefined);
t.is(count, 0);
await delay(100);
t.is(debounced(4), 3);
t.is(debounced(5), 3);
t.is(debounced(6), 3);
t.is(count, 1);
await delay(200);
t.is(count, 2);
});
test('before:true after:true options', async t => {
let count = 0;
const debounced = debounceFunction(value => {
count++;
return value;
}, {
wait: 20,
before: true,
after: true,
});
t.is(debounced(1), 1);
t.is(debounced(2), 1);
t.is(debounced(3), 1);
t.is(count, 1);
await delay(100);
t.is(count, 2);
t.is(debounced(4), 4);
t.is(debounced(5), 4);
t.is(debounced(6), 4);
t.is(count, 3);
await delay(200);
t.is(count, 4);
});
test('.cancel() method', async t => {
let count = 0;
const debounced = debounceFunction(value => {
count++;
return value;
}, {
wait: 20,
});
t.is(debounced(1), undefined);
t.is(debounced(2), undefined);
t.is(debounced(3), undefined);
debounced.cancel();
await delay(100);
t.is(debounced(1), undefined);
t.is(debounced(2), undefined);
t.is(debounced(3), undefined);
t.is(count, 0);
});
test('before:false after:true `maxWait` option', async t => {
let count = 0;
const debounced = debounceFunction(value => {
count++;
return value;
}, {
wait: 40,
maxWait: 50,
after: true,
before: false,
});
t.is(debounced(1), undefined);
t.is(count, 0);
await delay(30);
t.is(count, 0);
t.is(debounced(2), undefined);
t.is(count, 0);
await delay(30);
t.is(count, 1);
t.is(debounced(3), 1);
t.is(count, 1);
await delay(200);
t.is(count, 2);
});
test('before:true after:false `maxWait` option', async t => {
let count = 0;
const debounced = debounceFunction(value => {
count++;
return value;
}, {
wait: 40,
maxWait: 50,
after: false,
before: true,
});
t.is(debounced(1), 1);
t.is(count, 1);
await delay(30);
t.is(debounced(2), 1);
t.is(count, 1);
await delay(30);
t.is(count, 1);
t.is(debounced(3), 3);
t.is(count, 2);
await delay(50);
t.is(count, 2);
t.is(debounced(4), 4);
t.is(count, 3);
});
test('before:true after:true `maxWait` option', async t => {
let count = 0;
const debounced = debounceFunction(value => {
count++;
return value;
}, {
wait: 40,
maxWait: 50,
after: true,
before: true,
});
t.is(debounced(1), 1);
t.is(count, 1);
await delay(30);
t.is(debounced(2), 1);
t.is(count, 1);
await delay(30);
t.is(count, 2);
t.is(debounced(3), 3);
t.is(count, 3);
await delay(50);
t.is(count, 4);
t.is(debounced(4), 4);
t.is(count, 5);
});
test('maxWait triggers with after set to false', async t => {
let count = 0;
const debounced = debounceFunction(value => {
count++;
return value;
}, {
wait: 20,
maxWait: 50,
after: false,
before: true,
});
// Should invoke immediately since before is true
t.is(debounced(1), 1);
t.is(count, 1);
// `maxWait`` should not trigger the function since after is false
await delay(70);
t.is(count, 1); // No additional calls should have been made
});
test('`wait` and `maxWait` are the same', async t => {
let count = 0;
const debounced = debounceFunction(() => {
count++;
}, {
wait: 50,
maxWait: 50,
after: true,
});
debounced();
await delay(20);
debounced();
await delay(20);
debounced();
await delay(60); // Should be invoked once due to maxWait
t.is(count, 1);
});
test('`maxWait` less than `wait`', async t => {
let count = 0;
const debounced = debounceFunction(() => {
count++;
}, {
wait: 100,
maxWait: 50,
after: true,
});
debounced();
await delay(30);
debounced();
await delay(30); // Should be invoked here due to maxWait
t.is(count, 1);
await delay(100);
t.is(count, 1); // Should not be invoked again
});
test('continuous rapid calls preventing `after` invocation', async t => {
let count = 0;
const debounced = debounceFunction(() => {
count++;
}, {
wait: 50,
after: true,
});
const interval = setInterval(debounced, 10);
await delay(200);
clearInterval(interval);
t.is(count, 0); // Should never be called due to continuous rapid invocation
});