Error: Block-scoped variables in strict mode are not supported until Node.js 4.0.0 and Unexpected var, use let or const instead.

[parmarmitesh]

I am using npm version:- 6.14.5 and node version:- 12.16.1

Following are steps to build and test the maxmin package:

git clone https://github.com/sindresorhus/maxmin.git
cd maxmin
npm install
npm test

After performing npm test, I am getting following error, so can you help me please in this or suggest me steps if I missing something :

maxmin@2.1.0 test /maxmin

xo && ava

test.js:5:1
✖ 5:1 Block-scoped variables in strict mode are not supported until Node.js 4.0.0. The configured version range is >=0.12. node/no-unsupported-features/es-syntax
✖ 6:1 Block-scoped variables in strict mode are not supported until Node.js 4.0.0. The configured version range is >=0.12. node/no-unsupported-features/es-syntax
✖ 8:17 Arrow functions are not supported until Node.js 4.0.0. The configured version range is >=0.12. node/no-unsupported-features/es-syntax
✖ 13:17 Arrow functions are not supported until Node.js 4.0.0. The configured version range is >=0.12. node/no-unsupported-features/es-syntax
✖ 14:31 The Buffer.from is not supported until Node.js 4.5.0. The configured version range is >=0.12. node/no-unsupported-features/node-builtins
✖ 14:49 The Buffer.from is not supported until Node.js 4.5.0. The configured version range is >=0.12. node/no-unsupported-features/node-builtins
✖ 15:31 The Buffer.from is not supported until Node.js 4.5.0. The configured version range is >=0.12. node/no-unsupported-features/node-builtins
✖ 15:49 The Buffer.from is not supported until Node.js 4.5.0. The configured version range is >=0.12. node/no-unsupported-features/node-builtins
✖ 18:18 Arrow functions are not supported until Node.js 4.0.0. The configured version range is >=0.12. node/no-unsupported-features/es-syntax

index.js:2:1
✖ 2:1 Unexpected var, use let or const instead. no-var
✖ 3:1 Unexpected var, use let or const instead. no-var
✖ 4:1 Unexpected var, use let or const instead. no-var
✖ 5:1 Unexpected var, use let or const instead. no-var
✖ 6:1 Unexpected var, use let or const instead. no-var
✖ 13:2 Unexpected var, use let or const instead. no-var
✖ 13:6 The variable ret should be named returnValue. A more descriptive name will do too. unicorn/prevent-abbreviations

16 errors
npm ERR! Test failed. See above for more details.