@left-curve/utils

General-purpose utilities for the Dango ecosystem.

Installation

npm install @left-curve/utils
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Usage

import { Decimal, formatUnits, parseUnits, truncateAddress } from "@left-curve/utils";

const amount = Decimal("1000.50");
const formatted = formatUnits("1000000", 6); // "1.000000"
const parsed = parseUnits("1.5", 6); // "1500000"
const short = truncateAddress("0x1234...abcd");
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API

Decimal

Arbitrary-precision decimal arithmetic (wraps big.js). Use for all financial math — never use Number.

import { Decimal } from "@left-curve/utils";

const a = Decimal("100.5");
const b = a.mul(Decimal("2"));
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Formatting

• formatNumber(value, options) - locale-aware number formatting
• formatUnits(value, decimals) / parseUnits(value, decimals) - unit conversion
• truncateAddress(address) - shorten addresses for display
• truncateDec(value, digits) - truncate decimal places

Strings

• camelToSnake(str) / snakeToCamel(str) - case conversion
• capitalize(str) - capitalize first letter

Assertions

• assertString(value), assertNumber(value), assertBoolean(value), etc.
• assertDeepEqual(a, b) - deep equality check
• assertNotEmpty(value) - non-empty check

Async

• withRetry(fn, options) - retry with backoff
• withTimeout(fn, timeout) - timeout wrapper
• wait(ms) - promise-based delay
• withResolvers() - deferred promise

Objects

• recursiveTransform(obj, fn) - deep transform object values
• sortObject(obj) - sort object keys
• invertObject(obj) - swap keys and values

DEX

• calculateTradeSize(params), calculateFees(params), calculatePrice(params)
• adjustPrice(price, tickSize) - snap price to tick
• formatOrderId(id) - format order ID for display

Vault

• sharesToUsd(shares, params) / usdToShares(usd, params) - vault conversions
• computeVaultApy(snapshots) - compute vault APY from snapshots

Misc

• uid() - generate unique ID
• debounce(fn, delay) - debounce function calls
• tryCatch(fn) - Result type wrapper
• createSubscription(options) - subscription helper
• batchPoller(fn, interval) - batch polling
• getNavigatorOS(), isMobileOrTable() - browser detection

License

TBD