Function parseToPlanck

parseToPlanck(amount: string, decimals?: number): bigint
Parse a human-readable decimal token amount into its planck (smallest unit) representation.

Converts a string like "1.5" into the corresponding bigint planck value (e.g. 15_000_000_000n for 10 decimals). If the input has more fractional digits than decimals, excess digits are silently truncated with a warning log.
Parameters
- amount: string
  A non-negative decimal string (e.g. "1.5", "100", "0.001").
- decimals: number = 10
  Number of decimal places for the token (default: 10 for DOT).
Returns bigint
The planck value as a bigint.
Throws
If amount is empty, negative, or contains invalid characters.

Throws
If decimals is invalid.
Example
```
import { parseToPlanck } from "@polkadot-apps/utils";

parseToPlanck("1.5");        // 15_000_000_000n   (10 decimals, DOT default)
parseToPlanck("100");        // 1_000_000_000_000n
parseToPlanck("0.001", 12);  // 1_000_000_000n    (12 decimals)
```
- Defined in packages/utils/src/planck.ts:89