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util.ts
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// @ts-strict-ignore
export function last<T>(arr: Array<T>) {
return arr[arr.length - 1];
}
export function getChangedValues<T extends { id?: string }>(obj1: T, obj2: T) {
const diff: Partial<T> = {};
const keys = Object.keys(obj2);
let hasChanged = false;
// Keep the id field because this is mostly used to diff database
// objects
if (obj1.id) {
diff.id = obj1.id;
}
for (let i = 0; i < keys.length; i++) {
const key = keys[i];
if (obj1[key] !== obj2[key]) {
diff[key] = obj2[key];
hasChanged = true;
}
}
return hasChanged ? diff : null;
}
export function hasFieldsChanged<T extends object>(
obj1: T,
obj2: T,
fields: Array<keyof T>,
) {
let changed = false;
for (let i = 0; i < fields.length; i++) {
const field = fields[i];
if (obj1[field] !== obj2[field]) {
changed = true;
break;
}
}
return changed;
}
export function applyChanges<T extends { id: string }>(
changes: {
added?: T[];
updated?: T[];
deleted?: T[];
},
items: T[],
) {
items = [...items];
if (changes.added) {
changes.added.forEach(add => {
items.push(add);
});
}
if (changes.updated) {
changes.updated.forEach(({ id, ...fields }) => {
const idx = items.findIndex(t => t.id === id);
items[idx] = {
...items[idx],
...fields,
};
});
}
if (changes.deleted) {
changes.deleted.forEach(t => {
const idx = items.findIndex(t2 => t.id === t2.id);
if (idx !== -1) {
items.splice(idx, 1);
}
});
}
return items;
}
export function partitionByField<T, K extends keyof T>(data: T[], field: K) {
const res = new Map();
for (let i = 0; i < data.length; i++) {
const item = data[i];
const key = item[field];
const items = res.get(key) || [];
items.push(item);
res.set(key, items);
}
return res;
}
export function groupBy<T, K extends keyof T>(data: T[], field: K) {
const res = new Map<T[K], T[]>();
for (let i = 0; i < data.length; i++) {
const item = data[i];
const key = item[field];
const existing = res.get(key) || [];
res.set(key, existing.concat([item]));
}
return res;
}
// This should replace the existing `groupById` function, since a
// `Map` is better, but we can't swap it out because `Map` has a
// different API and we need to go through and update everywhere that
// uses it.
function _groupById<T extends { id: string }>(data: T[]) {
const res = new Map<string, T>();
for (let i = 0; i < data.length; i++) {
const item = data[i];
res.set(item.id, item);
}
return res;
}
export function diffItems<T extends { id: string }>(items: T[], newItems: T[]) {
const grouped = _groupById(items);
const newGrouped = _groupById(newItems);
const added: T[] = [];
const updated: Partial<T>[] = [];
const deleted = items
.filter(item => !newGrouped.has(item.id))
.map(item => ({ id: item.id }));
newItems.forEach(newItem => {
const item = grouped.get(newItem.id);
if (!item) {
added.push(newItem);
} else {
const changes = getChangedValues(item, newItem);
if (changes) {
updated.push(changes);
}
}
});
return { added, updated, deleted };
}
export function groupById<T extends { id: string }>(data: T[]) {
const res: { [key: string]: T } = {};
for (let i = 0; i < data.length; i++) {
const item = data[i];
res[item.id] = item;
}
return res;
}
export function setIn(
map: Map<string, unknown>,
keys: string[],
item: unknown,
): void {
for (let i = 0; i < keys.length; i++) {
const key = keys[i];
if (i === keys.length - 1) {
map.set(key, item);
} else {
if (!map.has(key)) {
map.set(key, new Map<string, unknown>());
}
map = map.get(key) as Map<string, unknown>;
}
}
}
export function getIn(map, keys) {
let item = map;
for (let i = 0; i < keys.length; i++) {
item = item.get(keys[i]);
if (item == null) {
return item;
}
}
return item;
}
export function fastSetMerge<T>(set1: Set<T>, set2: Set<T>) {
const finalSet = new Set(set1);
const iter = set2.values();
let value = iter.next();
while (!value.done) {
finalSet.add(value.value);
value = iter.next();
}
return finalSet;
}
export function titleFirst(str: string) {
return str[0].toUpperCase() + str.slice(1);
}
export function appendDecimals(
amountText: string,
hideDecimals = false,
): string {
const { separator } = getNumberFormat();
let result = amountText;
if (result.slice(-1) === separator) {
result = result.slice(0, -1);
}
if (!hideDecimals) {
result = result.replaceAll(/[,.]/g, '');
result = result.replace(/^0+(?!$)/, '');
result = result.padStart(3, '0');
result = result.slice(0, -2) + separator + result.slice(-2);
}
return amountToCurrency(currencyToAmount(result));
}
type NumberFormats =
| 'comma-dot'
| 'dot-comma'
| 'space-comma'
| 'space-dot'
| 'comma-dot-in';
export const numberFormats: Array<{
value: NumberFormats;
label: string;
labelNoFraction: string;
}> = [
{ value: 'comma-dot', label: '1,000.33', labelNoFraction: '1,000' },
{ value: 'dot-comma', label: '1.000,33', labelNoFraction: '1.000' },
{ value: 'space-comma', label: '1 000,33', labelNoFraction: '1 000' },
{ value: 'space-dot', label: '1 000.33', labelNoFraction: '1 000' },
{ value: 'comma-dot-in', label: '1,00,000.33', labelNoFraction: '1,00,000' },
];
let numberFormatConfig: {
format: NumberFormats;
hideFraction: boolean;
} = {
format: 'comma-dot',
hideFraction: false,
};
export function setNumberFormat(config: typeof numberFormatConfig) {
numberFormatConfig = config;
}
export function getNumberFormat({
format,
hideFraction,
}: {
format?: NumberFormats;
hideFraction: boolean;
} = numberFormatConfig) {
let locale, regex, separator, separatorRegex;
switch (format) {
case 'space-comma':
locale = 'en-SE';
regex = /[^-0-9,.]/g;
separator = ',';
separatorRegex = /[,.]/g;
break;
case 'dot-comma':
locale = 'de-DE';
regex = /[^-0-9,]/g;
separator = ',';
break;
case 'space-dot':
locale = 'dje';
regex = /[^-0-9,.]/g;
separator = '.';
separatorRegex = /[,.]/g;
break;
case 'comma-dot-in':
locale = 'en-IN';
regex = /[^-0-9.]/g;
separator = '.';
break;
case 'comma-dot':
default:
locale = 'en-US';
regex = /[^-0-9.]/g;
separator = '.';
}
return {
value: format,
separator,
formatter: new Intl.NumberFormat(locale, {
minimumFractionDigits: hideFraction ? 0 : 2,
maximumFractionDigits: hideFraction ? 0 : 2,
}),
regex,
separatorRegex,
};
}
// Number utilities
// We dont use `Number.MAX_SAFE_NUMBER` and such here because those
// numbers are so large that it's not safe to convert them to floats
// (i.e. N / 100). For example, `9007199254740987 / 100 ===
// 90071992547409.88`. While the internal arithemetic would be correct
// because we always do that on numbers, the app would potentially
// display wrong numbers. Instead of `2**53` we use `2**51` which
// gives division more room to be correct
const MAX_SAFE_NUMBER = 2 ** 51 - 1;
const MIN_SAFE_NUMBER = -MAX_SAFE_NUMBER;
export function safeNumber(value: number) {
if (!Number.isInteger(value)) {
throw new Error(
'safeNumber: number is not an integer: ' + JSON.stringify(value),
);
}
if (value > MAX_SAFE_NUMBER || value < MIN_SAFE_NUMBER) {
throw new Error(
'safeNumber: can’t safely perform arithmetic with number: ' + value,
);
}
return value;
}
export function toRelaxedNumber(value: string) {
return integerToAmount(currencyToInteger(value) || 0);
}
export function integerToCurrency(
n: number,
formatter = getNumberFormat().formatter,
) {
return formatter.format(safeNumber(n) / 100);
}
export function amountToCurrency(n) {
return getNumberFormat().formatter.format(n);
}
export function amountToCurrencyNoDecimal(n) {
return getNumberFormat({ hideFraction: true }).formatter.format(n);
}
export function currencyToAmount(str: string) {
let amount;
if (getNumberFormat().separatorRegex) {
amount = parseFloat(
str
.replace(getNumberFormat().regex, '')
.replace(getNumberFormat().separatorRegex, '.'),
);
} else {
amount = parseFloat(
str
.replace(getNumberFormat().regex, '')
.replace(getNumberFormat().separator, '.'),
);
}
return isNaN(amount) ? null : amount;
}
export function currencyToInteger(str: string) {
const amount = currencyToAmount(str);
return amount == null ? null : amountToInteger(amount);
}
export function stringToInteger(str: string) {
const amount = parseInt(str.replace(/[^-0-9.,]/g, ''));
if (!isNaN(amount)) {
return amount;
}
return null;
}
export function amountToInteger(n: number) {
return Math.round(n * 100);
}
export function integerToAmount(n) {
return parseFloat((safeNumber(n) / 100).toFixed(2));
}
// This is used when the input format could be anything (from
// financial files and we don't want to parse based on the user's
// number format, because the user could be importing from many
// currencies. We extract out the numbers and just ignore separators.
export function looselyParseAmount(amount: string) {
function safeNumber(v: number): null | number {
if (isNaN(v)) {
return null;
}
const value = v * 100;
if (value > MAX_SAFE_NUMBER || value < MIN_SAFE_NUMBER) {
return null;
}
return v;
}
function extractNumbers(v: string): string {
return v.replace(/[^0-9-]/g, '');
}
if (amount.startsWith('(') && amount.endsWith(')')) {
amount = amount.replace('(', '-').replace(')', '');
}
// Look for a decimal marker, then look for either 1-2 or 5-9 decimal places.
// This avoids matching against 3 places which may not actually be decimal
const m = amount.match(/[.,]([^.,]{5,9}|[^.,]{1,2})$/);
if (!m || m.index === undefined || m.index === 0) {
return safeNumber(parseFloat(extractNumbers(amount)));
}
const left = extractNumbers(amount.slice(0, m.index));
const right = extractNumbers(amount.slice(m.index + 1));
return safeNumber(parseFloat(left + '.' + right));
}
export function sortByKey<T>(arr: T[], key: keyof T): T[] {
return [...arr].sort((item1, item2) => {
if (item1[key] < item2[key]) {
return -1;
} else if (item1[key] > item2[key]) {
return 1;
}
return 0;
});
}