Algorand TypeScript Migration

Migrate smart contracts to Algorand TypeScript 1.0 from TEALScript or Algorand TypeScript Beta.

Migration Workflow

1. Identify Source Language

Determine whether the code is TEALScript or Algorand TypeScript Beta:

Indicator	TEALScript	Algorand TypeScript Beta
Import source	`@algorandfoundation/tealscript`	`@algorandfoundation/algorand-typescript`
Global types	Uses `assert`, `uint64` without imports	Requires explicit imports
Event logging	`new EventLogger<...>()`	N/A
Inner transactions	`sendAssetConfig({...})`	`itxn.assetConfig({...})`
Logic sig method	`logic()`	`program()`
Type syntax	`uint256`, `uint8` literals	`arc4.UintN<256>`, `arc4.UintN8`

2. Load Migration Guide

Based on the source language, read the appropriate reference:

From TEALScript: Read references/from-tealscript.md
From Algorand TypeScript Beta: Read references/from-beta.md

3. Execute Migration

Follow the checklist in the loaded reference file. Apply transformations systematically:

Start with imports and type renames (mechanical changes)
Update syntax patterns (inner transactions, method calls)
Add explicit type annotations where required
Handle semantic changes (mutability, resource encoding)
Rename test files if applicable

4. Verify Migration

After migration:

Ensure all imports resolve from @algorandfoundation/algorand-typescript
Verify no TypeScript errors remain
Run the Algorand TypeScript compiler to validate

Quick Reference

Common Import Pattern (1.0)

import {
  Contract,
  GlobalState,
  LocalState,
  Box,
  BoxMap,
  arc4,
  uint64,
  bytes,
  Bytes,
  Uint64,
  assert,
  err,
  emit,
  clone,
  itxn,
  gtxn,
  Txn,
  Global,
  op,
} from '@algorandfoundation/algorand-typescript';

Key Type Changes

Old	New (1.0)
`uint8`, `uint16`, `uint256`	`arc4.Uint<8>`, `arc4.Uint<16>`, `arc4.Uint<256>`
`arc4.UintN64`, `arc4.UintN<N>`	`arc4.Uint64`, `arc4.Uint<N>`
`arc4.UFixedNxM<N,M>`	`arc4.UFixed<N,M>`
`MutableArray`	`ReferenceArray`
`BoxRef`	`Box<bytes>`
`Address` (TEALScript)	`Account`
`AppID` (TEALScript)	`Application`
`AssetID` (TEALScript)	`Asset`

Key Function Changes

Old	New (1.0)
`x.copy()`	`clone(x)`
`arc4EncodedLength<T>()`	`sizeOf<T>()`
`arc4.interpretAsArc4<T>(b)`	`arc4.convertBytes<T>(b, { strategy: 'validate' })`
`x.native`	`x.asUint64()` or `x.asBigUint()`
`sendMethodCall<T>({...})`	`arc4.abiCall({ method: T, ... })`

Resources

references/

from-beta.md: Complete migration guide from Algorand TypeScript Beta to 1.0. Includes checklist of 13 breaking changes with before/after examples.
from-tealscript.md: Complete migration guide from TEALScript to Algorand TypeScript 1.0. Includes type migration table and 13 migration patterns with examples.

algorand-ts-migration