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authorRemco Bloemen <Recmo@users.noreply.github.com>2018-11-09 07:27:53 +0800
committerGitHub <noreply@github.com>2018-11-09 07:27:53 +0800
commitc448a409c1dd7411208aeb577b64ba1246fc03d1 (patch)
tree027cd21d0de2a18cd5ea4f79190cccd4c479eb64
parent689f8f1fbc34b6fa976f95419804f9eee7e637f6 (diff)
parentdfef33bc41221c3f0f38d7e1c3e4163455b98b79 (diff)
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Merge pull request #977 from 0xProject/feature/utils/prettybignum
Set custom inspect printer in BigNumber
-rw-r--r--packages/utils/src/configured_bignumber.ts23
1 files changed, 23 insertions, 0 deletions
diff --git a/packages/utils/src/configured_bignumber.ts b/packages/utils/src/configured_bignumber.ts
index 2b22b6938..34b57d303 100644
--- a/packages/utils/src/configured_bignumber.ts
+++ b/packages/utils/src/configured_bignumber.ts
@@ -11,4 +11,27 @@ BigNumber.config({
DECIMAL_PLACES: 78,
});
+// Set a debug print function for NodeJS
+// Upstream issue: https://github.com/MikeMcl/bignumber.js/issues/188
+import isNode = require('detect-node');
+if (isNode) {
+ // Dynamically load a NodeJS specific module.
+ // Typescript requires all imports to be global, so we need to use
+ // `const` here and disable the tslint warning.
+ // tslint:disable-next-line: no-var-requires
+ const util = require('util');
+
+ // Set a custom util.inspect function
+ // HACK: We add a function to the BigNumber class by assigning to the
+ // prototype. The function name is a symbol provided by Node.
+ (BigNumber.prototype as any)[util.inspect.custom] = function(): string {
+ // HACK: When executed, `this` will refer to the BigNumber instance.
+ // This is also why we need a function expression instead of an
+ // arrow function, as the latter does not have a `this`.
+ // Return the readable string representation
+ // tslint:disable-next-line: no-invalid-this
+ return this.toString();
+ };
+}
+
export { BigNumber };