ECPairFactory is not a function

[Alf71]

TypeError: require(...).ECPairFactory is not a function

[antonilol]

Did you npm install?

[Alf71]

Yes, both:

npm install bitcoinjs-lib
npm install ecpair

[antonilol]

Which script did you try to run?
Which OS do you have and which node and npm version do you run?

What does require('ecpair') print in nodejs repl?

[Alf71]

Ubuntu Server 18 running in Win10
priv_key_recovery.js
Node.js v14.16.1

`
node priv_key_recovery.js
/home/admin/recover/priv_key_recovery.js:2
const ECPair = require('ecpair').ECPairFactory(require('tiny-secp256k1'));
^

TypeError: require(...).ECPairFactory is not a function
at Object. (/home/admin/recover/priv_key_recovery.js:2:34)
at Module._compile (internal/modules/cjs/loader.js:1063:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
at Module.load (internal/modules/cjs/loader.js:928:32)
at Function.Module._load (internal/modules/cjs/loader.js:769:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)
at internal/main/run_main_module.js:17:47`

[antonilol]

i cant reproduce this (archlinux)
i tried the exact nodejs version (v14.16.1)

what does node -pe "require('ecpair')" print?
i get { default: [Getter], ECPairFactory: [Getter], networks: [Getter] } (it should include the ECPairFactory)

what version op ecpair do you have installed?
i have 2.0.1:

$ cat node_modules/ecpair/package.json | grep version
  "version": "2.0.1",

[Alf71]

I'm getting

{
networks: {
bitcoin: {
messagePrefix: '\x18Bitcoin Signed Message:\n',
bech32: 'bc',
bip32: [Object],
pubKeyHash: 0,
scriptHash: 5,
wif: 128
},
testnet: {
messagePrefix: '\x18Bitcoin Signed Message:\n',
bech32: 'tb',
bip32: [Object],
pubKeyHash: 111,
scriptHash: 196,
wif: 239
}
},
ECPair: [class ECPair]
}

[Alf71]

cat node_modules/ecpair/package.json | grep version
cat: node_modules/ecpair/package.json: No such file or directory

[antonilol]

looks like a really old version of bitcoinjs lib and ecpair
i think this patch will fix it but consider updating your node/npm

diff --git a/priv_key_recovery.js b/priv_key_recovery.js
index 35fd65d..40b68db 100644
--- a/priv_key_recovery.js
+++ b/priv_key_recovery.js
@@ -1,5 +1,5 @@
 const bitcoin = require('bitcoinjs-lib');
-const ECPair = require('ecpair').ECPairFactory(require('tiny-secp256k1'));
+const { ECPair } = require('ecpair');
 
 const base58chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'.split('');

[Alf71]

Thanks